backing groove of weld中文,backing groove of weld的意思,backing groove of weld翻译及用法 2026-10-16 21:57 浏览次数 29 backing groove of weld英[ˈbækɪŋ ɡru:v ɔv weld]美[ˈbækɪŋ ɡruv ʌv wɛld]焊缝反面坡口