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日本一区二区不卡视频,九色免费视频,99精品在线看,久久婷婷综合色一区二区,国产精品高清国产三级囯产AV,国产在线91在线电影,日本人真淫视频一区二区三区,天天色天天操综合网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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