内直径:64毫米
Inner diameter : 64 millimetres
费米子的玻色化技术
bosonnization technizne of fermion
亚微米直径光纤
Submicro-diameter optical fiber
大直径径向渗透率仪
full diameter radial permeameter
大直径直缝焊管
Large- sized straight weld pips
large-diameter butt welded pipe
large diameter longitudinal welded pipe
Large-sized straight welded tube