In the 20th century, there were many scientific achievements in China, such as what are they?

Qian Xuesen. Qian Sanqiang. And this.

<> 20th century, human scientific and technological achievements include computers, artificial satellites, nuclear satellites, radars, and airplanes.

1. Computer: commonly known as computer, is a modern electronic computer machine for high-speed calculation, which can perform numerical calculations and logical calculations, and also has the function of storage and memory. Inventor of the computer John von Neumann.

It is one of the most advanced scientific and technological inventions of the 20th century.

2. Artificial satellite: an unmanned spacecraft orbiting the earth in space orbit. Artificial satellites basically orbit the earth according to the laws of celestial mechanics, but the actual motion is very complicated due to the influence of the non-spherical earth's gravitational field, atmospheric drag, solar gravity, moon gravity and light pressure in different orbits.

3. Nuclear: The use of self-sustaining nuclear fission or fusion reaction instantaneously released huge energy to produce a first-class effect, and has a large-scale damage and destructive effect.

4. Radar: that is, using radio methods to discover targets and determine their spatial positions. For this reason, radar is also known as "radiolocation."

5. Aircraft: refers to a heavier-than-air aircraft with one or more engines that generates forward thrust or pull, generates lift by the fixed wings of the fuselage, and flies in the atmosphere. The airplane is one of the most significant inventions of the early 20th century, recognized as invented by the American Wright brothers.

1. The theory of relativity.

2. Quantum force is hungry.

3. DNA double helix knot accompaniment.

4. Nuclear energy. 5. Aerospace and aerospace technology for returning to the sky.

6. Biotechnology.

7. Laser technology.

8. Internet.

The science and technology of the 20th century also created television, nylon, and plastics, which greatly changed people's lives.

1. TV. The birth of television is one of the greatest inventions of mankind in the 20th century. In modern society, life without television is no longer conceivable.

Black-and-white and color TVs of all models and functions are miraculously and rapidly changing people's lives from assembly lines to factories, schools, hospitals, and homes around the world.

2. Nylon. Carothers, an American organic chemist, made a polymer from adipic acid and hexamethylenediamine in 1935, which was called polymer 66 at that time because these two components contained 6 carbon atoms. He melted the polymer and pressed it out with an injection needle, where it was stretched under tension called a fiber.

This fiber, polyamide 66 fiber, was named nylon after industrialization in 1939, and it was the earliest synthetic fiber variety to achieve industrialization.

3. Plastics. In the 60s of the 19th century, due to the shortage of ivory in the United States and the lack of raw materials for making billiards, the earliest artificially manufactured plastic celluloid was patented in 1869. Although celluloid is the earliest artificially manufactured plastic, it is a man-made plastic, not a synthetic plastic, the first synthetic plastic is a phenolic resin heating mold, which was made in the early 20th century, in 1910 by the American-Belgian chemist Beckland.

The significance of the invention of plastics

Plastic products are too common around us, you need plastic bags when you go to the supermarket to buy things, the packaging bags of snacks are also plastic, the crisper boxes you use to put food are also plastic products, and the silicone you use for smartphones, household appliances, cars, and even breast augmentation all contain plastic materials.

Plastic alone has saved the lives of countless elephants, so many environmentalists have no reason to hate plastic products, not because plastic pollutes the environment, but humans pollute the environment.

Plastic has also left valuable audio-visual materials for our human history, in the past, it was difficult for us human beings to leave any ** information except painting, and those who could afford to hire painters were rich, and the poor naturally could not leave anything.