Rain Shower,Rain Shower System,Rain Shower Faucet,Waterfall Shower System AIHUI Sanitary Ware , https://www.aihuisanitary.com I. Introduction Since the first CNC wire-cutting machine tool was successfully developed in China in 1967, it has passed more than 20 spring and autumn. From discrete components, microcomputer control to automatic programming, despite the fact that compared with advanced countries, it is not too late to start, but now it is behind, that is, we have not fully grasped the general trend of this emerging technology development.