精品国产柚木在线观看-国产一区二区免费在线观看-亚洲永久在线观看-久久久久久99精品亚洲-欧美高清色视频在线播放-韩国日本激情亚洲-我想看一级黄色毛片

He has been engaged in the research and development and mass production of heat-resistant alloy steel (39% nickel, 25% chromium) materials for many years. The main products cover automotive engine parts, and the main production is automated casting, five-axis hexahedral machining, and welding assembly processes. The main production parts are the turbine housing and supporting assembly components, which are the key components of the turbocharger.