直径和容积的豁免
Exemptions diameter and volume
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
二次线丛的直径
diameter of a quadratic complex
水斗式水轮机的直径比
Diameter Ratio of Pelton Turbine
线性线丛的直径
diameter of a liner complex