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亚洲中文字幕无码mv,波多野结衣一区二区三区四区视频 ,国产精彩视频在线观看,久久国产亚洲欧美日韩精品,波多野结衣的av一区二区三区,人妻丰满熟妇AV无码区,国产精品太粉嫩高中在线观看,国产成人综合亚洲网址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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