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欧美国产在线一区,国产亚洲精品精品精品,婷婷久久久亚洲欧洲日产国码AV,国产香蕉国产精品偷在线观看 ,免费无码av片在线观看网址,国产成人精品在线,国产二级一片内射视频播放,18禁黄无遮挡免费网站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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