视频一区二区三区免费在线观看,猛男又粗又大又深又硬又爽,又大又硬又黄又刺激的免费视频

Single crystal diamond cutting tools are not easy to stick to the knife and produce chippings during cutting. The surface quality is good, and it is an ultra-precision machining tool. The special properties of single crystal diamond tools make it irreplaceable in ultra-precision cutting processing. Among them, the single crystal diamond tip tools have been widely used in F-theta lenses, V-groove structures of optical fiber connectors, lenses, gratings and other optical Superfinishing of freeform surfaces and functional surfaces with complex microstructures.

On December 25, the Western International Technology Cooperation Industrial Park and Sichuan Mingtaishun Cemented Carbide Co., Ltd. held a Western Tool Summit in Shehong, Sichuan, and invited more than 100 domestic tool industry experts, scholars, professors, and corporate executives and technical directors. Attend the forum.