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欧美肥妇毛多水多bbxx,人人爽天天碰狠狠添,亚洲精品久久久久高潮,日韩精品无码区免费专区,国产亚洲精品久久精品69,精品国产乱码久久久久久小说,国产成人a视频高清在线观看 ,99re6在线视频精品免费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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