???? ????
亚洲v日韩v欧美在线观看,亚洲国产av无码精品,性欧美丰满熟妇xxxx性,中文字幕亚洲人妻系列,亚洲色av天天天天天天,国产亚洲AV无码一区二区二三区,国产精品免费露脸视频,美女福利一区二区三区在线观看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...
Copyright China Academy of Machinery Science & Technology Support:xinocheng