成全二人世界免费观看_激情都市亚洲一区二区_五个黑人玩一个女5p的小说_美女的裸体(无遮挡)的照片_国产古装妇女野外a片_九尾漫画免费漫画入口页面弹窗_老司机午夜精品99久久免费_亚洲成人国产_无码熟妇人妻av在线影片最多

CN EN
QQ
+86-(0)15021555579
qrCode

NEWS



Location:News >> 行業(yè)動態(tài)

China Made the World's Largest Weldless Integral Stainless Steel Ring Forging

Release time:2019/3/16
On March 12, the world's largest seamless integral stainless steel ring forging was successfully rolled using the metal construction forming technology developed by Institute of Metal Research, Chinese Academy of Sciences.