Just as the heroic weapons of inferior films and interstellar fiction chose weapons first when they came to mind, they were all laser weapons that generate a beam of coherent electromagnetic radiation by stimulating atoms or molecules to excite photons, but the rate of technologi.......

Foreign development status

In countries with relatively advanced industries, at the end of the 19th century, some people started to study road sweepers. By the 1920s, large-scale and medium-sized sweepers had already appeared on the market. .......

1. Punch should be used before using

1. Clean the punch with a clean rag.

2. Check if the surface has scratches or dents. I.......

The electrical schematic of the UV weather resistance test box is shown in Figure 2.1. In the electrical schematic diagram, we can see that the control section of the UV weather resistance test.......

When working in the sprinkler, China United Sprinklers must operate according to the vehicle's operating rules and cannot follow the experience. Otherwise, there will be breakdowns and damage to the Zhongshan sprinkler........

2.7 ~ 3μm mid-infrared laser has important application prospect in spectrum analysis, gas detection, laser medical treatment and optical parametric oscillation pump. Recently, with the support of the National Natural Science Foundation of China, Sun Dunlu, a researcher from th.......

Currently available on the market more than the sewage pump is known as non-clogging sewage pump, then whether it is the real sense of non-clogging it? Not necessarily! Often the user's sewage pump in the sewage pond in useless how long blocked by debris caused Motor burned, how to cho.......