黄色一级片网站视频_是一个完全免费的全国最大的成人色情网_日韩视频在线播放一区_免费A级视频在线直接观看

CN EN
QQ
+86-577-67926668
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.