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日韩精品一区二区三区视频,欧美成人看片一区二区三区尤物,黄色免费在线网址,亚洲日韩精品一区二区三区,久久av高清无码,亚洲一区不卡在线导航,蜜桃视频免费高清观看在线播放,亚洲一区二区变态丝袜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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