China's great inventions in the 2th century.

1. Atomic bomb:

On October 16th, 1964, the first atomic bomb developed by China was successfully exploded. According to the declassified data, China spent 2.8 billion RMB for the explosion of this atomic bomb.

On June 17th, 1967, China successfully conducted its first hydrogen bomb test, which broke the superpower's nuclear monopoly and blackmail policy and made great contributions to the Chinese people.

2. Television:

On September 2, 1958, the first TV set in China was successfully manufactured, and it began to broadcast black and white TV, and the corresponding TV industry was established. In 1973, it began to pilot broadcast color TV.

3. Sputnik:

At 18: on April 25, 197, Xinhua News Agency authorized the world to announce that on April 24, 197, China successfully launched its first Sputnik, with a perigee altitude of 439 kilometers and an apogee altitude of 2,384 kilometers.

the included angle between the orbital plane and the equatorial plane of the earth is 68.5 degrees, and it takes 114 minutes to circle the earth. The satellite weighs 173 kilograms and broadcasts Dongfanghong music with a frequency law of 2.9 megacycles.

4. High-speed train:

In November 1996, Guangzhou Railway Group signed a contract with ADTranz of Sweden to rent an X 2 train for two years, with an annual rent of $1.8 million.

To serve guangzhou-shenzhen railway operated by Guangzhou Railway Group, and try to introduce X 2 technology as quickly as possible, and test the feasibility of tilting trains in China. The maximum speed of the new speed power centralized electric tilting EMU can reach 21 km/h.

5. The first hydrogen bomb:

On June 17, 1967, China's first hydrogen bomb was successfully exploded in the Northwest Nuclear Weapons Development Base, which marked a new stage in the development of China's nuclear weapons.

It took China only two years and eight months from the successful nuclear explosion test of the first atomic bomb to the successful hydrogen bomb test, which is the fastest compared with other countries in the world.

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