Fast Science and Technology reported on January 4th that Tank 300, as the domestic off-road "online celebrity Car", has a sales volume of 10,000 vehicles all the year round. However, the PHEV plug-in version of this car has not been launched for a long time, which makes many car owners waiting for money very anxious.

According to domestic media reports, Gu Yukun, executive deputy general manager of the Great Wall TANK brand, said when talking about the listing time of the tank 300 Hi4-T in Weibo recently:"300 is currently in global supply, close to full capacity, and is coordinating production capacity resources. It is expected to be listed after the Spring Festival."

This year’s Spring Festival holiday is from February 10th to February 17th. From the time point of view, the tank 300 Hi4-T will be listed in late February at the earliest.

Prior to this, the tank 300PHEV plug-in version has appeared in the new car declaration catalogue of the Ministry of Industry and Information Technology, and the car will also be the tank 300 Hi4-T version.

It is equipped with the same 2.0T engine and ternary lithium battery pack as the tank 500 Hi4-T,The total energy of the power battery pack is 37.11kWh, matching the vertical 9HAT gearbox.The maximum power is 185kW, which is stronger than the 167kW of 2.0T on the current fuel version.

The battery life is 105 kilometers, and the fuel consumption is 2.29L/100km. Based on the price of No.92 gasoline in Beijing today, it only takes about 17 cents to run one kilometer.

However, this is the fuel consumption of the vehicle under WLTC condition, and the fuel consumption should be above 5L/100km when driving in urban areas or off-road conditions.

Even so, compared with the fuel consumption of 9-10L/100km in the urban area of the fuel tank 300, the fuel consumption level of the tank 300 Hi4-T version will be greatly reduced, and the competitiveness of the vehicle will be enhanced simultaneously.

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The exterior design of the Eπ 008 is unique and full of technology. The front face adopts a family-style Xingyao air intake grille, with sharp LED headlights on both sides, showing a strong visual impact. The body lines are smooth, the overall style is tough and stylish, highlighting its unique personality and charm.

车系eπ008拥有5002*1972*1732mm的长宽高尺寸，轴距为3025mm，前轮距和后轮距均为1650mm，确保了宽敞舒适的车内空间。车侧线条流畅而动感，搭配265/45 R21规格的轮胎和时尚的轮圈设计，突显出强烈的运动气息。

eπ008的内饰设计采用了简约而不失科技感的风格，车内采用了大量高品质材料，提升了整体的豪华感。方向盘采用真皮包裹，手感出色，并且支持手动上下和前后调节，满足不同驾驶者的个性化需求。中控台上配备了一块15.6英寸的高清触控屏，集成了多媒体系统、导航、电话、空调等多种功能，并且支持语音识别控制，提高了操作的便捷性和智能化水平。车内还配备有USB和Type-C接口，方便乘客为电子设备充电。前排座椅采用了仿皮材质，支持前后调节、靠背调节、高低调节以及腰部支撑调节，提供舒适的乘坐体验。主驾驶座椅还具备加热、通风、按摩功能，并配备了头枕扬声器，提升了舒适性和娱乐体验。副驾驶座椅同样支持多种调节功能。第二排座椅支持靠背和腿托调节，提升了后排乘客的舒适度。此外，后排座椅可以按比例放倒，增加了行李空间的灵活性。

eπ008搭载了一台1.5T 147马力的高效L4发动机，最大功率达到108千瓦，最大扭矩则为210牛·米。与之匹配的是电动车单速变速箱，为车辆提供了强劲的动力输出和平顺的驾驶体验。

汽车之家车主 对 eπ008 的外观给予了高度评价，她表示：“外形很大气！前脸很帅！颜值高！开出去回头率很高！车标也简洁！” 这种设计无疑使得 eπ008 成为了路上的一道亮丽风景线。

　　　　　　 CCTV News:Israel local time today (March 2) morning, that is, Beijing time today (March 2) afternoon, Israel’s 23rd parliamentary elections began to vote. At present, 29 political parties and coalitions of political parties have decided to stand for election. According to the latest polls, the Likud Party, the largest right-wing conservative party in Israel led by the current Prime Minister Benjamin Netanyahu, and the Blue and White Party, the middle party, rank high and have equal strength.

　　　　　　 This election is the first time that Israel has held a general election for the third time in less than a year. In April and September 2019, Israel held the 21st and 22nd parliamentary elections. After two sessions of parliament, they were dissolved because of the failure to form a cabinet.

　　　　　　 Israel is a parliamentary country, with a total of 120 seats in the parliament, and political parties with more than half of the seats can form a separate cabinet. However, due to the proliferation of small and medium-sized parties, there has never been a single party forming a cabinet in Israeli history.

source map

　　　　　　 [News Background] It is difficult to form a cabinet. Israel has held three general elections in less than a year.

　　　　　　 Due to the serious differences between parties and the difficulty in reconciling interests, Israel has been deadlocked in forming a cabinet after the first two general elections, and the new government has always been "difficult to produce", which has also led to the "strange phenomenon" of Israel holding three general elections in less than one year for the first time in history.

　　　　　　 On April 9 last year, Israel held the 21st parliamentary election. Although Netanyahu, the leader of Likud Group and the current Prime Minister, obtained the right to form a cabinet, he failed to successfully form a ruling Coalition within the prescribed time limit. The reason is that the right-wing party "Israel is our homeland" led by former Israeli Defense Minister Lieberman is difficult to balance the interests of several other religious parties, which led to the "abortion" of forming a cabinet and forced the parliament to dissolve and hold another general election.

　　　　　　 After the 22nd parliamentary election held on September 17th last year, Israeli President rivlin authorized Netanyahu and the leader of the "Blue and White Party" Ganz to form a cabinet, but their efforts to form a cabinet still ended in failure because of the great differences between the parties. Lieberman called for the formation of a "broad and free coalition government" composed of Likud Group, Blue White Party and Israel is our homeland. However, the negotiations among Netanyahu, Ganz and Lieberman failed to reach an agreement.

　　　　　　 Compared with the previous two general elections, the third general election to be voted today has added several uncertainties.

　　　　　　 First of all, on January 28th, the United States announced the so-called "New Middle East Peace Plan" to promote the settlement of the Palestinian-Israeli issue, which was explicitly rejected by the Palestinian side, and the tension between Palestine and Israel escalated again. And about half of Israelis believe that this move of the United States aims to intervene in Israeli elections and help Netanyahu win — — But not long ago, Netanyahu, suspected of corruption, was formally charged, and the case will be heard on the 17th of this month, half a month after the general election, which is very likely to affect voters’ voting intention.

　　　　　　 At the same time, there have been some changes in the position of Netanyahu’s main rival Ganz — — Although "refusing to face trial with Netanyahu ‘ Take turns to govern ’ " His position has not changed, but Ganz turned to oppose the "Joint List" party of the Arab political party alliance to join the Coalition government and supported the so-called "New Middle East Peace Plan" of the United States, which may make the "Blue and White Party" lose some votes of the center-left voters.

　　　　　　 [News Watch] I am afraid that the deadlock in the formation of the cabinet is still difficult to break.

　　　　　　 At present, analysts are generally worried that after the end of the third general election in less than a year, Israel may still face a "tug-of-war" to form a cabinet, which will lead to the deadlock of forming a cabinet again.

　　　　　　 Many polls before the election showed that Likud Group and Blue and White Party are still evenly matched, and both sides may win about 33 seats, with a difference of at most two seats — — The third general election may still be difficult to change the political deadlock after the previous two general elections.

　　　　　　 In the previous two general elections, the Likud Party and the Blue-White Party tried their best to win over their allies, but they failed to win at least 61 of the 120 parliamentary seats needed to form a cabinet. It can be seen that after the third general election, the two parties still need to win over the "Israel is our home" party led by Lieberman. However, it is still very difficult for both Netanyahu and Ganz to pull Lieberman into their respective camps.

　　　　　　 As domestic analysts in Israel have said, "it is hard to see substantial changes in the Israeli political situation after the third general election", and the dystocia of the new government will directly affect the deliberation of Israel’s national budget and the introduction of important decisions. Israel’s political system is facing a serious crisis, and some people even have to silently accept the possibility of holding the fourth general election next — — If we want to break the deadlock in the formation of the cabinet, we must make a decisive compromise between the various parties.

If you want to buy a car, it is estimated that you are also struggling to buy what products are best for you. The richness of the configuration is closely linked to the cost performance of a car, and many people have mentioned it. As for the outstanding performance of the car, please read it together.

Let’s look at the appearance of Star Era ET first. The front of Star Era ET looks very sharp and sporty. Then it adopts a deep headlight design, which improves its level. The car is equipped with LED daytime running lights, automatic opening and closing, adaptive far and near light, delayed closing and so on. Coming to the side of the car body, the size of the car body is 4955 mm * 1975 mm * 1698 mm. The car adopts fashionable and atmospheric lines, which gives people a very eye-catching feeling. With large-sized thick-walled tires, it looks full of sports. In the design of the rear end, the rear end looks more fashionable and generous, and the taillights are very fashionable, very fashionable and concise.

When you get into the car, the overall visual effect of Star Era ET interior is very distinctive, and the visual effect is quite unique. The steering wheel of the car is well designed, equipped with electric up and down+front and rear adjustment, steering wheel memory, steering wheel heating and other functions, giving people an impulse to control it. Take a look at the central control. The design of the center console is reasonable, which makes the interior style impressive and conforms to the temperament of the car. Let Xiaobian introduce the dashboard and seats. The dashboard design is remarkable and very eye-catching. The car uses leather seats, equipped with auxiliary seat with memory electric adjustment, seat with memory electric adjustment, seat proportion down and other functions, and the overall comfort and wrapping are not bad.

Xing Ji Yuan ET matched gearbox, 413KW, 691N.m, with good power performance.

The car is equipped with car networking, driving mode selection, remote control key, Bluetooth key, NFC/RFID key, UWB digital key, rear wiper, interior atmosphere light and other configurations, and the configuration has reached the mainstream level of the same level.

Summary: The car introduced today is remarkable in terms of space, configuration and power, and home travel is also a good helper.

　　In the new era, Socialism with Chinese characteristics has made great achievements, and China is increasingly showing the image of a great country with beautiful mountains and rivers. The picture shows Hulu River in Xiji County, Guyuan City, Ningxia after treatment. Xinhua News Agency reporter Wang Peng photo

　　On September 23, the first "One Belt, One Road" International Ocean City Cultural Photography Week opened in Dalian. The picture shows visitors enjoying the photographic works on display. Xinhua news agency

　　Socialism with Chinese characteristics is the theme of the whole theory and practice of the Party since the reform and opening-up, and it is the fundamental achievement that the Party and the people have made through untold hardships and paid a huge price. Since the reform and opening up, the great creation and great achievements of Socialism with Chinese characteristics’s theory and practice have not only profoundly changed China, but also profoundly influenced the world.

　　In the new era, to further strengthen the "four self-confidences" and consistently uphold and develop Socialism with Chinese characteristics, we need to profoundly grasp Socialism with Chinese characteristics’s great contribution in the history of world socialism development and human society development.

　　1. Glowing the strong vitality of scientific socialism.

　　Since the reform and opening-up, the Communist Party of China (CPC) has led the people of all ethnic groups in China to unswervingly March forward along the road of Socialism with Chinese characteristics, pushing China’s economic strength, scientific and technological strength, national defense strength and comprehensive national strength into the forefront of the world, promoting China’s international status to achieve unprecedented promotion, and making China increasingly show the image of an oriental power with clear politics, economic development, cultural prosperity, social stability, people’s unity and beautiful mountains and rivers. In just 40 years, Socialism with Chinese characteristics has made scientific socialism glow with great vitality in China with a population of more than 1.3 billion, and its significance and contribution are of course extremely significant and self-evident.

　　First, it proves that Marxism and scientific socialism will never fade. Whenever the international communist movement suffers setbacks and the world socialism falls into a low tide, there are always voices that question the truth of Marxism and scientific socialism. After the drastic changes in Eastern Europe, the world was suddenly filled with various arguments such as "failure", "bankruptcy", "failure" and "outdated" of Marxism. Over the past 40 years, Socialism with Chinese characteristics’s great achievements have not only proved the absurdity of these arguments, but also proved the great truth power and vitality of Marxism. Because, these great achievements are precisely the result of long-term efforts by the Communist Party of China (CPC) people who have always believed in the scientificity and truth of Marxism and regarded Marxism as an expert, United and led the people of all ethnic groups throughout the country, adhered to Marxism as the fundamental guiding ideology, unswervingly followed the correct path of Marxism in China, kept pace with the times and practiced the basic principles of Marxism and scientific socialism. In the new era, Socialism with Chinese characteristics has made great achievements, so we must cherish the truth value of Marxism leading the times, persevere in promoting the modernization and popularization of Marxism in China, and make Marxism shine more brilliantly.

　　Second, it has set up a dazzling great banner of scientific socialism in the world, that is, the great banner of Socialism with Chinese characteristics. Needless to say, after the drastic changes in Eastern Europe, it was doubtful whether socialism could stand in the world at that time. Regarding this question, Comrade Deng Xiaoping said that as long as socialism in China does not fall, socialism will always stand in the world. After long-term efforts, Socialism with Chinese characteristics has not fallen, but has entered a new era and become the mainstay of world socialism. This is of great significance to Marxism, scientific socialism and world socialism.

　　Third, it has greatly boosted the confidence of the people of the world in socialism. In the history of the development of world socialism, Socialism with Chinese characteristics’s great theoretical and practical creation is of great significance to shake things up and restore confidence, and it also proves how far-sighted Comrade Deng Xiaoping was when he put forward in early 1992 that "there will be more people in favor of Marxism in the world". Indeed, in the face of Socialism with Chinese characteristics’s great achievement of "unique scenery here", more and more people in the world will seriously think about the development prospects of socialism. We have reason to believe that as long as we hold high the great banner of Socialism with Chinese characteristics in the world, and as long as Socialism with Chinese characteristics makes more and more original contributions to the development of Marxism in the new era, the attraction of scientific socialism in the world will surely increase day by day, and world socialism will finally usher in a bright future.

　　2. Expanding the way for developing countries to move towards modernization.

　　Since the reform and opening up, socialism in China has been full of hope, vitality and new vitality. The fundamental reason is that our party has led the people out of a correct path. Such a road is the Socialism with Chinese characteristics Road. Practice has proved that Socialism with Chinese characteristics Road is the only way to realize socialist modernization and create a better life for the people. Socialism with Chinese characteristics Road was gradually formed by China based on its own national conditions and practice, drawing wisdom from Chinese civilization, drawing on the strengths of various schools in the East and the West, sticking to it but not being rigid, learning from it but not copying it. This road is neither "traditional" nor "foreign", nor "westernized", but "original", which is the result of our party’s hard work, pioneering and enterprising, exploring the truth and grasping the law.

　　It should be pointed out that it is not easy for us to walk out of such a correct path. The Communist Party of China (CPC) and the people of all ethnic groups in China under his leadership finally woke up after setbacks and hesitation, and finally came out successfully. As the General Secretary of the Supreme Leader said: "In the past, we copied our books and imitated others. We were confused and frustrated. We hit a wall again and again, woke up again and again, practiced again and again, and broke through again and again, and finally embarked on a road to success in Socialism with Chinese characteristics."

　　Socialism with Chinese characteristics Road is a right path on earth, which belongs not only to China, but also to the world. Socialism with Chinese characteristics’s entry into a new era means that it provides a brand-new choice for countries and nations in the world who want to speed up their development and maintain their independence, and expands the way for developing countries to move towards modernization.

　　On the choice of modernization road, China has always advocated the diversification of development mode. No one should regard his own development road as a statue, let alone impose his own development road on others, and has always resolutely safeguarded the diversity of human civilization development. However, this does not mean that China’s modernization road has no reference significance for the modernization of developing countries. In fact, since the international financial crisis, there have been many problems in the western development model and road, and the prospects are worrying, and the world has generally begun to lose confidence in it. Many developing countries have paid special attention to studying and learning from the valuable experience of Socialism with Chinese characteristics Road, which is "unique in scenery".

　　Socialism with Chinese characteristics Road shows the world that there is no universally applicable development road in the world, and the modernization road should proceed from the national conditions. The road to modernization should put people’s interests first, and take improving people’s lives and enhancing people’s well-being as the starting point and the end result. The road to modernization should adhere to reform and innovation, and there is no way out of rigidity and stagnation. The road to modernization must persist in seeking common development through opening up, and closing the country to the outside world and beggar-thy-neighbor can only lead to a dead end.

　　3. Contributed to China’s wisdom and China’s plan to solve human problems.

　　Socialism with Chinese characteristics’s great contribution to the development history of human society lies in that it has fully demonstrated China’s image as a responsible big country that adheres to peaceful development, promotes common development, safeguards international fairness and justice, and contributes to mankind. At the same time, it has contributed and will continue to contribute to China’s wisdom and China’s plan to solve human problems.

　　China’s wisdom and China’s plan for maintaining world peace. Socialism with Chinese characteristics has not only greatly enhanced the power of loving and maintaining peace in the world, but also contributed to China’s solution to world peace problems, that is, abandoning the cold war mentality and power politics, unswervingly holding high the banner of peace, development, cooperation and win-win, adhering to the road of peaceful development, taking a new road of state-to-state exchanges of dialogue without confrontation and partnership without alliance, promoting civilized exchanges of harmony but diversity and eclecticism, and promoting the building of a community of human destiny.

　　Contributed to the Chinese program to promote the common development of mankind. Socialism with Chinese characteristics adheres to the principles of mutual respect, equal treatment, win-win cooperation and common development, insists that all countries are participants, contributors and sharers of global development, combines the interests of the people of China with the common interests of the people of all countries, and allows more countries and regions to participate in the construction of the Belt and Road. Welcome all parties to take the express train and free ride developed by China, strive for fair development for all countries, especially developing countries, and strive to enhance the development capacity of all countries, improve the international development environment, and

　　It should be pointed out that while China is committed to eradicating poverty, it has always actively carried out South-South cooperation, supported and helped developing countries, especially the least developed countries, to reduce poverty, improve people’s livelihood, improve the development environment, and promote the building of a community of human destiny. China has helped more than 120 developing countries to implement the Millennium Development Goals, which has injected a strong impetus into accelerating the overall development process of developing countries.

　　China’s wisdom and China’s plan to improve global governance. Socialism with Chinese characteristics adheres to the concept of global governance, advocates the democratization of international relations, insists that all countries, big or small, strong or weak, rich or poor, are equal, supports the United Nations to play an active role, supports expanding the representation and voice of developing countries in international affairs, insists that China should play a responsible role as a big country, actively participates in the reform and construction of the global governance system, and injects Chinese strength into the reform and optimization of global governance.

　　Contributed to the Chinese program of mankind’s pursuit of a better social system. Socialism with Chinese characteristics not only firmly believed that "history has not ended, nor can it be ended", but also declared the bankruptcy of "the conclusion of the end of history" and the bankruptcy of the one-line historical view based on the western institutional model. Socialism with Chinese characteristics contributed to the China wisdom of mankind in pursuing a better social system. China’s practice has explained a truth to the world: governing a country and promoting a country’s modernization is not just the way of the western system model, and countries can completely go out of their own way.

　　Socialism with Chinese characteristics has also provided China’s plan for mankind’s exploration of a better social system. For example, firmly occupy the moral commanding heights to promote the progress of human society and realize the beautiful ideals of mankind. Dare to open the door to stubborn diseases accumulated for many years, dare to touch deep-seated interests and contradictions, resolutely break through the shackles of ideas, resolutely break the barriers of solidification of interests, and resolutely remove institutional and institutional obstacles that hinder the development of social productive forces. Dare to promote theoretical innovation, practical innovation, institutional innovation and other aspects of innovation, so that the system is more mature and stereotyped, development is more quality, governance is more level, and people have a sense of gain, satisfaction and happiness.

　　 (Author: China Academy of Social Sciences Supreme Leader New Era Socialism with Chinese characteristics Thought Research Center Author: Liu Zhiming)

Writing/Photo courtesy of Liu Zhirong

You can’t always stay at home, but you have to travel, or commute to work, or go on business trips, sightseeing, and travel can’t be separated from subways, railways and highways. When you take subways, trains and highways, have you ever wondered: How are those tunnels dug through them?

Early tunnel excavation was manual plus blasting.

In the past, the way of tunnel excavation was manual excavation and blasting. For soil layer and gravel geology, manual excavation was used, and tools such as pickaxe and shovel were used to excavate the tunnel face. As far as rock geology is concerned, pickaxes and shovels can’t be dug, so it is necessary to use explosives to blast rocks at the tunnel face, and then transport the gravel out of the tunnel.

"Face" is a civil construction term, which refers to the excavation face that keeps advancing during tunnel construction.

As far as subway tunnels are concerned, in the past, the "open excavation and landfill method" technology was mostly adopted, that is, the street was destroyed first, and a ditch was dug by uncovering the cover, and then the tunnel wall was poured in the ditch. After the tunnel was built, it was buried and compacted with earthwork, and the street was repaired again. In the early days of Chinese mainland, the subway tunnel was excavated by "open excavation and landfill method", and later the "shield machine excavation method" was adopted. Shield machine was used to dig tunnels in the construction of Guangzhou’s first subway line (Line 1).

In the past hundred years, shield machines have gradually become popular in tunnel excavation. At present, shield machines are basically used in long tunnel excavation.

Britain used a shield machine to dig tunnels in 1825.

"Shield machine" is a name in China, generally known as "tunnel boring machine" (TBM) internationally, and "mole" in civil engineering jargon, because it digs holes underground like a mole.

In 1825, Britain used a shield machine when digging the Thames Tunnel. This shield machine was invented by Sir Mark issam Bald brunell, a French-born British engineer, and he applied for a patent for the shield machine. The Thames Tunnel is 396 meters long and passes through the Thames River in London.

In 1845, the international railway from France to Italy was opened. This railway ran across the Alps, and it was necessary to dig the Freres Tunnel at an altitude of 1,123 meters. This tunnel was 14 kilometers long, which was the longest tunnel in the world at that time. The tunnel ran through the Freres Peak at an altitude of 2,932 meters, that is to say, the maximum thickness of the rock above the tunnel was 1,809 meters.

In order to build this tunnel, Henry Joseph Mauss invented the "mountain cutting machine", which was manufactured in an arsenal near Turin, Italy in 1846. The "mountain cutter" looks like a locomotive, with more than 100 vibrating drill bits in front, which are used to smash the rocks on the face. "Mountain cutting machine" already has some functions of modern shield machine.

In 1853, ebenezer Talbot, an American, applied for the patent of shield machine, and the patent name was "Tunnel Boring Machine".

In 1870, john D bruton, an Englishman, developed and manufactured a shield machine with cutter head, which is very close to the shield machine widely used now.

In 1875, the French National Assembly passed a bill to build the English Channel Tunnel, and the British shield machine was selected for excavation. From June 1882 to March 1883, the shield machine excavated 1882 meters on the British side; Alexander Lavalle, a French contractor who built the Suez Canal, used a shield machine to dig 1,669 meters on the French side. Practice has proved that the efficiency of tunneling with shield machine is very high. However, the project was terminated in 1883 because France was later worried that Britain would use the English Channel Tunnel to attack France.

The success of shield machine in the English Channel Tunnel has inspired many civil engineers. In 1883, Britain used a shield machine to dig the tunnel under the Mersey River from Biegenheit to Liverpool, with a diameter of 2.1 meters and a length of 2 kilometers.

In the 20th century, people constantly improved the shield machine. Nowadays, all kinds of shield machines are constantly running in tunnel projects all over the world every day.

How does the shield machine dig the tunnel?

It is easier to understand the working principle of shield machine from its international common name "tunnel drilling rig": it is a big drilling rig that drills a hole in the ground or mountain.

Shield machine can be regarded as the largest construction machinery in civil engineering, with a large diameter of 178 meters and a length of more than 100 meters. The front of the shield machine is a huge cutter head with cutter head array. When driving, the cutter head rotates to cut the earth and stone on the tunnel face, and the muck flows into the muck bin from the gap of the cutter head, which is conveyed to the belt conveyor by the screw machine, and then transferred to another longer belt conveyor to transport it to the muck disposal site outside the tunnel, or transported to the tunnel by the track muck truck.

Readers with a little common sense should understand that if there is no thrust behind the cutter head, it is impossible to cut the earth and stone on the face. So, how to give the cutter head thrust?

This thrust comes from the hydraulic jack of the shield machine. If the tunnel is excavated on hard rock, two huge hydraulic jacks on the shield machine lean backward against the rock walls on both sides of the excavated tunnel and push the cutter head forward to cut the tunnel face.

If the tunnel is dug in the soft geological layer, the above method cannot be used, because the hydraulic jack will sink into the soft tunnel wall and cannot provide thrust. At this time, it is necessary to use another method to make several small hydraulic jacks push against the lining segment installed at the back at the same time to provide thrust for the cutter head horizontally forward, which is also a common shield method in subway tunnels at present.

The lining segment is the reinforced concrete precast member on the tunnel surface that we can see with our naked eyes in the tunnel. These segments are made in the ground reinforced concrete precast yard. After the segment is transported into the tunnel mouth, there is no need for manual intervention, and the transportation to installation is completely automatic.

The width of the lining segment should match the distance that the hydraulic jack advances each time, that is to say, the width of the segment is as many centimeters as the hydraulic jack advances each time. When the hydraulic jack is pushed to the end, the cutterhead stops rotating to cut the tunnel face, and segments are assembled around the tunnel in the shield section of the shield machine. The segment assembling machine on the shield machine is as dexterous as a human hand, movable, rotatable and retractable, which can assemble segments in place steadily and safely with accuracy of millimeter level.

When assembling a segment, several hydraulic jacks responsible for jacking the segment will contract, leaving a certain space for assembling the segment. After the segments are assembled in place, the hydraulic jack will stretch out and gently hold it, and so on until all segments in this circle are assembled in place. At this point, all the hydraulic jacks began to pressurize evenly, and together with the newly assembled segment, the cutter head was pushed forward by the reaction force to continue cutting the working face and move forward.

During the construction of the shield machine, the cutterhead cuts the tunnel face and assembles segments alternately, and the whole shield machine moves forward step by step under the push of the hydraulic jack until the tunnel is dug through. If the geology is soft, tens of meters can be excavated every day; If you encounter hard rocks, you can only dig dozens of centimeters every day.

The gap between the lining segment and the tunnel wall should be filled with mortar to reinforce the segment, maintain the stability of the whole lining and prevent water from leaking into the tunnel.

The series of complicated processes mentioned above are all completed automatically by the shield machine. There is a central control room in the shield machine, and all key parts of the shield machine have sensors, which transmit the collected data to the central control room. Operators can know the working situation of the shield machine through various data displayed on the display and intervene when necessary.

The cutter head on the cutter head should be maintained and replaced frequently. There is also a sensor on the cutter head. When the temperature of the cutter head rises to a certain value, it will send an alarm signal to the central control room.

How does the shield machine turn in the tunnel?

After reading this, some readers may ask, can the shield machine turn in the tunnel?

Of course you can. Most urban subway tunnels are excavated under the streets, and the tunnels are designed along the streets, with constant turns and "jumping up and down" according to the underground conditions. Highway and railway tunnels should also be selected according to landform, geology and hydrology, which also requires the shield machine to turn 360 degrees.

The turning of shield machine is realized by changing the cutting direction of cutter head with lining segment. Where a turn is needed, the width of each ring of lining segment is different. If turning to the left, the width of the right segment is designed to be wider than that of the left segment according to the turning radius. In this way, the hydraulic jack on the right will tilt the cutter head to the left to realize the left turning. If turning right, the width of the left segment is designed to be wider than that of the right segment according to the turning radius, so that the hydraulic jack on the left will tilt the cutter head to the right and realize the right turn. The steering principle of "jumping up and down" is the same as above.

At present, the largest shield machine in the world has a diameter of 17.5 meters.　　

On September 15th, 2006, the Niagara Tunnel, which was used for water diversion irrigation in Canada, was drilled. The tunnel was 10.2km long and passed 140m underground in Niagara Falls, Ontario, Canada. The shield machine used was "Big Becky" made by Robbins Company of the United States, with a diameter of 14.4m. The cutter head was driven by 15 motors with a power of 4.7 million watts (6,375 horsepower), which was the largest shield machine in the world at that time. The reason why tunnels should be dug in such a deep underground is to prevent shield construction from affecting ground buildings.

In 2011, the 5030-meter-long Spavo Tunnel near Florence, Italy was drilled. The rock shield machine used was Martina produced by Herrick Company of Germany. The shield has a diameter of 15.62 meters, a length of 130 meters, a weight of 4,500 tons, a cross-section of 192 square meters, a total power of 18 megawatts and a thrust of 40,000 tons. Herrick also designed a shield machine with a diameter of 19.25 meters, but it has not yet been built.

Bertha, a shield machine made by Hitachi Shipbuilding Co., Ltd. in Japan in 2012, has a diameter of 17.5 meters, a length of 110 meters and a weight of 7,000 tons. The cutter head has 260 cutter heads. This shield machine was ordered by the Washington State Transportation Bureau of the United States and used to replace the tunnel excavation of Alaska Viaduct on Highway 99 (the upper and lower lanes of the tunnel), which is by far the largest shield machine in the world.

Advantages and disadvantages of shield tunneling

There are many advantages in tunneling with shield machine. It is not affected by ground factors and can be constructed all day; It also does not destroy the ground buildings, cultural relics and natural environment, and belongs to ecological and environmental protection construction; Because the excavation, muck discharge and lining segment are all automated, a lot of labor is saved and the accident risk is reduced.

The main disadvantage of tunneling with shield machine is that the initial investment cost is too high. Most shield machines are customized according to tunnel design drawings, with long construction preparation period, high maintenance cost, and low economic benefits of tunneling short tunnels. Generally speaking, the tunnel length is more than 1 km, which has economic benefits.

Finally, the shield machine can not only dig circular tunnels, but also be designed to dig tunnels with arbitrary cross sections, such as rectangular tunnels and elliptical tunnels. People also use shield machines to dig water pipelines, sewage and drainage pipelines, and even power pipelines.

The car home-Shanghai preferential promotion channel brings good news. XT6, a luxury SUV model of Cadillac, is carrying out an explosive price reduction preferential activity. In Shanghai, consumers can enjoy an attractive discount of up to 123,000 yuan, which makes XT6, which originally started at 312,700 yuan, have a more competitive price. This undoubtedly provides an excellent opportunity for car buyers to buy a car. If you want to seize this discount, click "Check the car price" in the quotation form immediately, and let professional consultants help you win a higher discount amount and realize your dream of luxury car.

Cadillac XT6 shows the modern design concept of elegance and strength. Its front face design is unique, and the iconic shield-shaped air intake grille is made of chrome, giving the vehicle exquisite and atmospheric visual effects. The overall style of streamlined body lines combined with tough contours creates an aesthetic experience that pays equal attention to luxury and dynamics. XT6 fully demonstrates Cadillac’s unique views on luxury SUV design, both in details and overall shape.

Cadillac XT6 shows the unique charm of luxury cars with its elegant and smooth side design. The body size is 5056mm x 1964mm x 1777mm, and the wheelbase is 2863mm, which ensures a spacious interior space. The balanced distribution of the front wheel track of 1687mm and the rear wheel track of 1683mm not only enhances the stability of the vehicle, but also improves the dynamic performance of driving. Tyre size is 235/65 R18, with exquisite rim design, which is not only practical and wear-resistant, but also adds visual beauty to the vehicle. On the whole, XT6’s side lines are in harmony with proportions, which shows the perfect combination of luxury and strength.

The interior design of Cadillac XT6 continues the exquisite style of luxury brands, and adopts a steering wheel wrapped in high-grade leather, which brings a comfortable grip and excellent texture. The 8-inch central control screen integrates multimedia functions and is easy to operate. It supports USB, SD and Type-C interfaces to meet the diverse needs of drivers for multimedia. In terms of seats, leather-like materials are used, and the main and passenger seats provide four-way manual adjustment, including front and rear, backrest and height. The front seats are also equipped with heating function, and the driver’s seat also has electric memory function. The second row of seats is also practical, supporting front and rear and backrest adjustment, and has the function of proportional reclining, providing passengers with flexible seating space and loading convenience. The overall interior design takes both luxury and practicality into consideration, showing the high-end positioning of Cadillac XT6 as a luxury SUV.

Cadillac XT6 is equipped with a 2.0T turbocharged engine with a maximum power of 174 kW and a maximum torque of 350 Nm. This power unit can provide a strong output of 237 horsepower, matched with a 9-speed automatic manual transmission, ensuring the efficiency and driving pleasure of the vehicle.

To sum up, Cadillac XT6 has won high praise from car home car owners for its domineering appearance and excellent body technology. He said that this car can not only meet the needs of male car owners for face, but also make people satisfied with the details. Therefore, XT6 is undoubtedly a quality choice worthy of consideration for consumers who pursue quality and style.

A starving baby, if the mother has other conditions such as insufficient milk, will usually be fed by other lactating mothers instead. This kind of behavior in humans is popularly called "wet nurse feeding", and scientifically it is defined as allomaternalbreastfeeding.

In fact, scientists have observed similar phenomena not only in humans, but also in rodents and primates. A recent study by scientists in China has further expanded the scope: the research team led by Zuo Fu, a professor at the School of Life Science and Technology of Central South University of Forestry and Technology, and Li Ming, head of the primate ecology research group of the Institute of Zoology, Chinese Academy of Sciences, obtained the evidence of the old world monkey’s maternal lactation for the first time. The research results were published on February 21st, Beijing time, in Science Progress, a sub-magazine of Science.

Breastfeeding behavior of Sichuan golden monkey. The pictures in this paper are provided by the research team.

In an interview with The Paper reporter (www.thepaper.cn), Zuo Fu said, "This is the first time to report that regular partheno-lactation exists in Old World monkeys, which has expanded the distribution of partheno-lactation in primates and made it appear in different groups such as proto-monkeys, New World monkeys, Old World monkeys and even humans."

Higher primates, that is, anthropophagus, include New World monkeys distributed in South America and Old World monkeys distributed in Eurasia (Old World). Previously, there was no report about the maternal lactation behavior of Old World monkeys. According to Zuo Fu, the research team started this new research in 2012 and observed it continuously for five years. The research was carried out in Dalongtan Research Base of Shennongjia National Park in Hubei Province.

The research base has a group of about 90 golden snub-nosed monkey. Sichuan golden monkey is endemic to China, with a golden fur. They are distributed in the forests at the junction of Hubei, Sichuan, Shaanxi and Gansu, and distributed in Minshan, Qionglai, Daxueshan, Xiaoliangshan, Qinling, Shennongjia and the northern slope of Motianling.

"We began to study the monkey group in 2006, and the researchers were able to identify all individuals over 3 years old in the group." Zuo Fu said that the birth of Sichuan golden monkey is basically concentrated in the period from March to May every year. Because the coat color and body shape of baby monkeys are similar, it is not easy to identify them, so there is no concern about whether there is maternal breastfeeding at first. "Until the spring of 2011, after accidentally finding a female monkey feeding two baby monkeys at the same time, the research team carefully observed the breastfeeding behavior of Sichuan golden monkeys in the group and found that the breastfeeding behavior of different mothers was more common."

This latest paper shows that in the field observation conducted by Zuo Fu et al. for five years in a row and after five farrowing seasons, 40 (87%) of 46 baby monkeys of Sichuan golden monkey were breast-fed by one or more non-mother monkeys, and 22 (48%) of 46 baby monkeys were breast-fed by at least two other mothers. This behavior of maternal breastfeeding mainly occurs in the first three months after the baby monkey is born.

The research team also found that 6 of the 46 baby monkeys did not receive maternal breastfeeding at all, and 4 of them died in the cold winter. In comparison, among the 40 baby monkeys that were breast-fed by at least one non-mother monkey, a total of 6 eventually died, and the mortality rate was greatly reduced.

It is worth noting that Sichuan golden monkey generally lives in temperate forests with high altitude, and it is extremely cold in winter for five months, and the food supply also has strong seasonal changes. Partheno-breastfeeding behavior may help baby monkeys fight against unfavorable living environment.

Zuo Fu said, "The behavior of maternal breastfeeding may provide energy support for the rapid development of baby monkeys after birth, so that the baby monkeys can feed in advance to achieve a good development state before the severe winter, and can successfully survive the winter of extreme low temperature and food shortage. This behavior may also provide energy support for the rapid development of the brain, which makes the brain capacity of golden monkeys relatively large."

Generally speaking, the behavior of maternal breastfeeding only occurs within three months or less after the baby monkey is born, and it almost stops when the baby monkey begins to eat natural food.

In addition, the research team also found that the maternal breastfeeding behavior in Sichuan golden monkey still follows certain principles. Baby monkeys can not suck milk in all non-maternal monkeys: the maternal breastfeeding behavior of Sichuan golden monkey only occurs between females who are related or breastfeeding each other.

It is mentioned in the paper that kinship-usually the "grandmother" or "aunt" of baby monkeys, or reciprocity plays an important role in maternal breastfeeding. About 90% female monkeys (25 out of 28) will breast-feed the cubs of other female monkeys who have breast-fed their own baby monkeys in the current or next year, which is similar to "reward".

Zuo Fu believes that the maternal breastfeeding behavior occurs between females who are related or cooperate with each other, and the mother will allow other females to contact the baby monkeys in the early stage of development, which is necessary for the infant-mother-maternal care relationship in the early stage of human evolution, so this study also provides a new perspective for understanding human evolution.

　　　　Biological samples collected from the dead China woman’s body on the "Blagoveshchensk-Moscow" train, as well as laboratory analysis data in the carriage, have arrived in Moscow.

　　　　Onishchenko, director of the Russian Consumer Rights Protection and Public Welfare Supervision Bureau and chief epidemic prevention physician of the Russian Federation, made the above statement on Thursday, according to the Russian new network news.

　　　　He said that the inspection will be conducted simultaneously in two specialized laboratories of the Ministry of Health and one laboratory of the Ministry of National Defense.

　　　　He pointed out that due to the death of a woman in China on the train, the health department started the traditional epidemic prevention emergency mechanism.

　　　　On the morning of April 15th, a 24-year-old Russian woman died unexpectedly while riding a long-distance train from the Russian Far East city of Blagoveshchensk to Moscow. Fifty-one Russian migrant workers and two Russian train attendants were sent to the local infectious disease hospital for isolation observation when the train stopped at the Kirov station. It is reported that the final destination of these China migrant workers is Kaluga.

　　　　This incident has attracted great attention from the Ministry of Foreign Affairs of China. On April 16th, Foreign Ministry spokeswoman Jiang Yu said at a regular press conference that the Ministry of Foreign Affairs attached great importance to the situation that "a Russian woman may have died of pneumonia while taking a train in China".

Editor: Li Xiuwei

　　Every year, on the eve of the college entrance examination, there will always be some old news and news of the college entrance examination that have been repeatedly proved to be false on the Internet, misleading candidates and the public. To this end, the education department, the online information department and the public security organs have combed and summarized the fake news and false information of the college entrance examination with the highest frequency of "cold rice and hot speculation" over the years, and reminded the majority of netizens that behind these rumors are scams carefully designed by unscrupulous merchants, websites and even recidivists. The three departments specially remind candidates and parents to distinguish between rumors and beware of being deceived. I hope that all websites will not provide a platform for rumors, and I hope that netizens will not believe or spread rumors.

　　First, spend money to buy college entrance examination questions and answers.

　　Every year, criminals peddle so-called "true college entrance examination questions" and "top secret answers" on phishing websites, flaunting seductive information such as "extremely high accuracy" and "refund for breach of contract", and asking users to pay in advance in the name of "advance deposit". There are also those who claim that they can pay "gunmen" to take the test. Some criminals send viruses to users’ computers or mobile phones in the name of transmitting "sample test papers" to obtain user information.

　　Case: On the eve of the college entrance examination in 2018, the police in Hohhot cracked a case of selling so-called "college entrance examination questions". It is reported that under the name of QQ, some people have established a large number of QQ groups such as "2018 college entrance examination internal questions", hyped up the sale of college entrance examination original questions at the price of each set of 300 yuan, and ensured that "half of the real questions in each subject" and "get the real questions in the college entrance examination at 6 am on June 6, and send them out on time at 5 pm". After grasping conclusive evidence, the police handling the case arrested the suspect Dai Moumou. After the trial, the suspect Dai Moumou confessed to his fraud. Dai confessed that the so-called college entrance examination questions are actually a set of simulated college entrance examination papers purchased online at the price of each set of 200 yuan.

　　Reminder: The college entrance examination questions belong to the national top secret materials, and their storage and transportation have strict management measures. All personnel who come into contact with the examination papers are subject to closed management. The majority of candidates and parents should not be lucky, and do not believe that the so-called college entrance examination questions and answers are obtained in advance. Buying so-called "true college entrance examination questions" and "top secret answers" online are all false information released by scammers. It is illegal to buy classified materials, so don’t try.

　　The Criminal Law of People’s Republic of China (PRC) clearly stipulates that it is illegal to "organize cheating", "provide cheating equipment or other help for others to commit the crime mentioned in the preceding paragraph", "illegally sell or provide the test questions and answers specified in the first paragraph to others for the purpose of cheating in the exam" and "replace others or let others take the test specified in the first paragraph instead of themselves".

　　Second, look for candidates who have lost their admission tickets

　　Every year, on the day of the college entrance examination, the information lost by the candidates’ admission ticket will be circulated on the Internet. After seeing it, the majority of netizens were anxious for the candidates and quickly forwarded it in the group and friends circle, forming a public opinion with a large influence in a short time. After the incident, the education department quickly verified that some candidates did not lose their documents at all, and some information did not match completely, which can be said to be basically false information. The public security organs also confirmed that the left mobile phone numbers are generally fraudulent calls. Fraudsters make up stories to cheat social kindness. If a good-hearted person calls back according to the phone number and operates according to the phone prompt tone, he may fall into the trap of charging.

　　Case: In 2016, "My friend picked up an admission ticket, so please inform me if you know it: name: Bai Yaqian, test center: No.1 Middle School, examination room: 013, seat number: 11, admission ticket number: 204101311, contact number: 159 * * * 8941, spread, spread, don’t delay the children’s college entrance examination. Help others leave a lingering fragrance! " This is a false news that has been circulating on the Internet for many years. In 2017, there were many lost information about the admission ticket, and those who lost the admission ticket were Liu Mingwei, Yang Leilei, Sun Chao and Dang Xilong. In 2018, "Liu Mingxi" and "Liu Mingting" students lost the admission ticket again, and the content completely copied the routines of previous years.

　　Reminder: After seeing similar information, it is recommended to contact the report phone number published by the candidate’s middle school or provincial admissions examination institutions for confirmation. It is not recommended to forward it without verification, or to call the contact phone number left after the information.

　　Third, the marking teacher only cares about the progress, regardless of right or wrong.

　　Every year after the end of the college entrance examination, before and after the results are announced, there are always people on the internet who speculate that the marking work of the college entrance examination in a certain place is extremely serious, and the marking teachers even mark it indiscriminately, regardless of right or wrong. Facts have proved that people who post these posts are often out of curiosity, and some candidates and parents who have a large or unsatisfactory gap in college entrance examination results think that there is something wrong with marking and arbitrarily guess the information.

　　Case: In a well-known forum, there was a post "The college entrance examination marking teacher risked his life to expose the inside story, so the future of students was delayed". The poster claimed to have participated in marking the college entrance examination in a province, and the marking teacher only wanted to catch up with the progress, or ignored the confusion, or "approved the composition in one minute", disregard for human life. This post is related to the content of the college entrance examination, attracting attention and quickly becoming a hot spot, which is reprinted in major forums. Some netizens shouted, "No wonder their scores in the college entrance examination were lower than expected, so that’s how they were cheated." The education department and the public security organs quickly checked people. According to the poster, it was just for fun, to attract netizens’ attention and improve their popularity. They didn’t participate in the marking of the college entrance examination themselves. Some of them listened to rumors and made their own interpretations. They realized the seriousness of the matter and deleted the content themselves and apologized to the society.

　　Reminder: marking the college entrance examination papers is a very serious job. At present, the popular "online marking" embodies fairness and justice from system design to actual operation. For example, most provincial marking teachers have to pass the "three levels", that is, the qualification level. All middle school teachers who participate in marking work must be backbone teachers with the title of middle school education level or above. The head of the department and the head of the topic are university teachers with high academic level, rich teaching experience and the title of associate professor or above. Those who do not meet the above qualifications are not allowed to participate in marking; Training pass, all marking teachers must be trained in marking standards, master the marking standards and requirements, and those who have not participated in the marking standards training are not allowed to participate in marking work; All marking teachers must pass the examination. Before marking, each marking teacher must pass at least 7 of the 10 assessment papers. In the marking process, irregular assessments are also made. If the two assessments fail, no formal marking is allowed. Before the formal marking, a trial marking should be conducted, and scientific and reasonable scoring rules should be formulated according to the scoring reference and the actual situation of the candidates’ answers, and the formal marking should be strictly implemented in accordance with the scoring rules. The system of "one person evaluates one question" is generally implemented to ensure the quality of marking. For Chinese and English compositions, the system of "double evaluation" by different teachers is adopted. If the "double evaluation" exceeds a certain error, it will be submitted to the third teacher for "three evaluation" to ensure the accuracy and effectiveness of the evaluation. In addition, there are strict marking quality monitoring procedures to check, review and correct the marking quality of the marking staff throughout the process.Supervise and correct the phenomenon that the grading teacher may have different understanding of leniency and strictness in marking.

　　Fourth, big data volunteers, charging sky-high consulting fees.

　　On the eve of volunteering for the college entrance examination every year, there are always intermediaries or websites claiming to master internal big data. Local education examination institutes have made it clear that they have not cooperated with any social organizations or enterprises. According to the requirements of the Ministry of Education for information disclosure, the examination institutes have made public the enrollment plan, admission results and other data, and issued volunteer reference materials to candidates for research and reporting before applying for volunteers. The so-called "internal big data" of merchants is purely a rumor, which is nothing more than a marketing slogan. The accuracy of its data needs to be scrutinized, and there are some uncertain factors in voluntary reporting, such as the performance of candidates in this college entrance examination will affect the changes in their scores, and other candidates’ voluntary reporting.

　　Case: An education and training institution advertises on its website, such as "Fill in the volunteers accurately" and "Don’t waste a penny". Candidates can buy VIP cards with different denominations, such as 20,000 yuan and 10,000 yuan, and enjoy one-on-one "accurate" guidance. After the college entrance examination, the reporter interviewed the candidates and parents who bought VIP cards. The candidates and parents generally reported that the volunteer guidance provided by the company was not professional enough, and some data were inaccurate. However, the admission data of the past three years, the open interpretation of volunteering skills and the close attention to the admission dynamic information of the examination institute issued by the education department are more accurate and practical.

　　Reminder: Parents and classmates are advised to be cautious and vigilant when reporting these volunteer apps and advertisements.

　　Five, you can spend money to change the college entrance examination results.

　　Every year, after the college entrance examination, candidates and parents are introduced by acquaintances or learned on the Internet, so that they can get to know the experts who can enter the high-level recruitment system through hackers, modify the college entrance examination results, and ask for high-priced "service fees" at the same time, so that students can get satisfactory results.

　　Case: After the end of the college entrance examination in 2015, Qinhuai police found that there were fraud cases in the area where the score was changed as bait. Ms. Zhang and Mr. Liu, who live in Qinhuai District, were cheated out of nearly 10,000 yuan. After being detected by the police, the suspect Zhang confessed that he posted information as a "hacker" on the Internet, claiming that he could modify the scores of college entrance examinations and college exams, and asked the victims for "service fees" ranging from thousands to tens of thousands of yuan. People have been fooled in recent years.

　　Reminder: Online posts claiming to be able to modify college entrance examination scores are pure scams. The so-called hacker intrusion modification score is not technically feasible. Because the online marking of college entrance examination is not on the internet, but on the intranet, there is no possibility of external hacking. Before the candidates’ scores are released, the original data are archived and backed up in different places. After being released through the network, the examination institute will monitor and match the online information, and the websites will set up a strict anti-hacker virus attack system.