极品玩弄白浆喷水在线看_欧美又硬又长又黄又爽视频_二拍一视觉摄影怎么样_国内精品2020情侣视频_亚洲精品久久无码产区

Coating power supply in vacuum coating (magnetron sputtering), why is pulse bias power supply better than DC power supply?

Vacuum coating A technique for producing thin film materials by physical means. In the vacuum chamber atoms of the material are isolated from the heating source and hit onto the surface of the plated object.