亚洲国产区久久久久久国产_国产日韩欧美高清专区_高清亚洲先锋在线电影观看网站_韩国午夜福利理论片在线观看_成人国产第区在线观看_刘婷在线观看亚洲一区二区_男人舔女人天堂网站_国产 亚洲 丝袜 制服_www亚洲精品色片天堂_日本精品久久久中文字幕6

QingDao Three-Star Precision Forging Gear Co.,Ltd.. was founded in 1976, is China's earliest use of precision forging production gear professional enterprises, is the national excellent forging process model enterprises, the China Forging Association, China Gear Association sponsor, is Shandong Provincial technology development center, Qingdao high-tech enterprises, and cooperation with the China Ocean University set up a mold and special materials Institute. The main products are automotive, engineering machinery and agricultural machinery drive axle differential precision forging gear.