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成人国内精品久久久久影院,人人爽人人爽人人片a∨,影音先锋亚洲成aⅴ无码,亚洲成色av网站午夜影视,天天狠天天透天干天干,国内精品久久久久久久影院,3d无码纯肉动漫在线观看,亚洲色欲在线播放一区The General Institute of Machinery Group independently develops and produces various engineering materials, including high quality welding materials, green surface protection materials, advanced die materials and composite materials.
The Group independently develops and produces a series of key parts, including high-end precision castings, gear transmission units, precision forming parts and so on.
The General Machinery Institute Group has been engaged in foundry, welding and cutting, plastic forming, heat treatment, surface treatment and other technical fields for many years. It can provide relevant technical services and equipment.
China Academy of Machinery Science and Technology (CAM), founded in 1956, is...
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