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国产午夜福利片在线观看,亚洲熟妇色自偷自拍另类,国产精品爽爽v在线观看无码,色欲久久久天天天综合网,亚洲精品亚洲人成在线观看,少妇又色又紧又爽又刺激视频,国产精品老热丝在线观看,两个人看的www视频免费完整版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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