The so-called vacuum, is given space, gas pressure below 101325Pa state. Under vacuum, the pre…
On February 8th, Shijiazhuang High-tech Zone held a conference to summarize and commend and …
International Energy Network News: The reporter has been inf…
45# steel is a carbon structural steel with a carbon content of 0.45%. It is widely used in mac…
In summer, the girls don't forget to wear sunscreen, sun protection umbrellas, and sun pro…
The business club reported on June 1 that the atmosphere of …
Users in different industries also show great differences in…
PVC-…
According to the Central Meteorological Observatory, from 21 to 24, heavy rains occurred in…