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成年无码av片在线狼人,久久久无码精品午夜,国产精品高潮呻吟av久久男男,日韩欧美精品一中文字幕,亚洲日韩日本中文在线,欧美丰满熟妇乱xxxxx视频,无码精品不卡一区二区三区,久久毛片免费看一区二区三区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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