不等直径桩
unequal dimension pile foundation
中值直径变化
fluctuation of median diameter
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
ECAP(等径角挤压)
ECAP(equal channel angular pressing
SST等值线
multi-section interpolating