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国产亚洲精品久久久久久动漫,少妇系列之白嫩人妻,欧美品无码一区二区三区在线蜜桃 ,色综合久久久无码网中文,欧美亚洲另类丝袜综合,久久亚洲欧美国产精品,午夜精品射精入后重之免费观看,亚洲国产精品久久久久制服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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