1, scientists use their inventions to benefit mankind.
He devoted his life to science and invented many things.
The four great inventions are the crystallization of the wisdom of the ancient people in China.
4. The fact that fish depends on the swim bladder for ups and downs inspired people to invent submarines.
People visited the youth invention exhibition with great interest.
6. No wonder Dad is so happy. It turns out that he has obtained a patent for invention.
7. After expert evaluation, Uncle Wang's invention was patented.
Scientists have invented many advanced devices to meet people's daily needs.
9. Bi Sheng invented letterpress printing, which made a new breakthrough in printing.
10, Edison studied hard and made more than 1000 inventions, which was really fruitful.
1 1, China has four great inventions: compass, papermaking, printing and gunpowder.
12, the invention of papermaking is of decisive and far-reaching significance in the history of human civilization.
13. At the scientific research meeting, everyone introduced new ones and showed their own inventions.
14. In recent years, he has painstakingly invented a new product and obtained a national patent.
15, China first used a compass to tell the direction, then used Sina, and then invented the compass.
16, Malan paper is a kind of paper made of Malan grass by Yan 'an people during the Anti-Japanese War. Although it looked rough, it was a meaningful invention in the harsh environment at that time and was widely used in books and newspapers.
17. Soon, in the late Neolithic period, Tao Jun's invention made it possible to make containers with the same shape.
People think that the stirrup was invented in China.
19. The invention relates to a cyclone jet washing water saver, which consists of a cyclone nozzle, a cyclone and a multistage spray gun.
20. By adopting the catalyst pretreatment method of the invention, the outlet pressure of the catalyst feed pump is obviously lower, and the catalyst feed is stable without blockage.