The United States has developed a "paper" that is rewritable by heating, using glass or plastic film as a medium. 2019-11-23
China's first CT20C surface hydraulic core drilling rig was successfully put into operation 2019-11-22
The inaugural meeting of the Superhard Materials Tools Professional Committee of Henan Mechanical Engineering Society was held in Zhengzhou 2019-11-22
Online home promotion efforts to weaken the line of home stores on the "double 12" do not buy it 2019-11-22