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狠狠躁天天躁中文字幕,无码人妻专区免费视频,一本久道久久综合久久爱,国模裸体无码xxxx视频,日本高清一二三不卡区,国产精品丝袜亚洲熟女,亚洲欧洲日产国码高潮αv,亚洲成国产人片在线观看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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