Write a news (short story) about the new achievements in the construction of the motherland

Known as the "roof of the world", the Qinghai-Tibet Railway was put into trial operation today, setting a number of railway records in China and even the world.

The Qinghai-Tibet Railway, with a total length of 1956 km from Xining to Lhasa, is the plateau railway with the highest altitude, the longest route and the worst climatic conditions in the world.

On the most challenging project in the plateau of the world, the railway builders in China have solved and overcome the "three major problems": the severe challenges of frozen soil, cold and lack of oxygen and ecological fragility.

The Three Gorges Project benefits the people.

Today, with the increasing shortage of energy in the world, people attach importance to the development and protection of rivers. The appearance of the Three Gorges Dam once again shows the foresight of decision makers. On May 20th, the whole line of Three Gorges Dam was poured to the design elevation185m, and the main project was completed nine months ahead of schedule. This great cross-century project has created many firsts in the world and begun to show the comprehensive benefits of flood control, power generation and shipping.

BEIJING, April 4 (Xinhua) According to the Oriental Morning Post, yesterday afternoon, Shanguang Chen, director of the Astronaut Research and Training Center, the head of the China astronaut system, said that the astronauts were currently carrying out the "Shenzhou 7" extravehicular walking training.

According to relevant space experts, the launch time of Shenzhou VII is expected to be 2008. The biggest difference from Shenzhou VI is that extra-vehicular activities have been added, including walking, operating, screwing and installing equipment, all of which are to prepare for the establishment of a space station in the future. Or the Qinghai-Tibet Railway has created many railway historical records in China and even the world.

Known as the "roof of the world", the Qinghai-Tibet Railway was put into trial operation today, setting a number of railway records in China and even the world.

The Qinghai-Tibet Railway, with a total length of 1956 km from Xining to Lhasa, is the plateau railway with the highest altitude, the longest route and the worst climatic conditions in the world.

On the most challenging project in the plateau of the world, the railway builders in China have solved and overcome the "three major problems": the severe challenges of frozen soil, cold and lack of oxygen and ecological fragility.

Since the construction of the Golmud-Lhasa section of the Qinghai-Tibet Railway started on June 29th, 20001year, the Ministry of Railways started construction in Golmud-Wang Kun section in 20001year according to the general arrangement of gradual progress from north to south, subsection construction and subsection track laying. The world's largest plateau railway bridge base was built in Nanshankou, and the frozen soil engineering test section started construction, which won the first battle.

In 2002, the frozen soil project north of Tanggula Mountain and some key projects in Tibet started, and the track was laid to Wang Kun Station, which made a key breakthrough.

In 2003, the construction of "no man's land" and the south of Tanggula Mountain was started, and the Tanggula Mountain subgrade project and Beiqiao Tunnel were completed, which won a great victory in the year of comprehensive attack;

In 2004, subgrade, bridge and culvert tunnels were basically completed, and the world's highest bridge base was built in Amdo at an altitude of more than 4,700 meters, ending the history of no railway in Tibet and promoting the overall success of that year.

In 2005, all the works in front of the station were completed, the track laying and beam erection were completed, and the decisive battle was in hand, which laid a solid foundation for building a world-class plateau railway.

On March/KOOC-0/day, 2006, the speed target of freight train engineering operation test of Qinghai-Tibet Railway reached/KOOC-0/00 km per hour. On May 1 day, the running test target of passenger trains (without passengers) reached the speed of 100 km, and some sections reached the speed of 120 km. The whole line was put into trial operation in July 1 day, and the speed line required frozen soil area100km and non-frozen soil area120km.

The total investment of Qinghai-Tibet Railway exceeds 33 billion yuan; 78.53 million cubic meters of subgrade earthwork and 675 bridges were completed along the whole line, nearly160,000 linear meters; 2050 culverts with a horizontal linear meter of 37662 meters; There are 7 tunnels with a length of 9074 meters.

At the same time, the Qinghai-Tibet Railway has also achieved fruitful results in tackling key problems in frozen soil, health protection, environmental protection and quality assurance.

The Qinghai-Tibet Railway was put into trial operation on July 1 day, and it is expected to become a world-class plateau railway with unmanned management along the line.

In the 2008 Olympic Games, the "God Seven" asked for heaven.

The Three Gorges Project benefits the people.

Today, with the increasing shortage of energy in the world, people attach importance to the development and protection of rivers. The appearance of the Three Gorges Dam once again shows the foresight of decision makers. On May 20th, the whole line of Three Gorges Dam was poured to the design elevation185m, and the main project was completed nine months ahead of schedule. This great cross-century project has created many firsts in the world and begun to show the comprehensive benefits of flood control, power generation and shipping.

The National Stadium started construction on February 24, 2003, and was temporarily suspended due to design adjustment on July 30, 2004. Work resumed on February 27, 2003, and it is expected to be completed in March 2008. The total project cost is 2.267 billion yuan.

The external structure of the "Bird's Nest" is mainly composed of a huge portal steel frame and 24 truss columns. The top of the National Stadium is saddle-shaped, with a major axis of 332.3 meters and a minor axis of 296.4 meters. The height of the highest point is 68.5 meters and the height of the lowest point is 42.8 meters. ..

The stadium shell adopts air cushion film, which can be used as filler to make the roof completely waterproof, and the sunlight can penetrate through the transparent roof to meet the growth needs of indoor lawns. During the competition, the stands can be varied to meet the requirements of different audiences in different periods. During the Olympic Games, there were 20,000 temporary seats on the top of the stadium, and everyone could see the whole stadium clearly. Through the reasonable division and design of streamline area, the problems of entrance, exit and people flow are perfectly solved.