基本解釋[機(jī)] 無(wú)坡口對(duì)接焊 平頭對(duì)接焊縫詞組短語(yǔ)短語(yǔ)open square butt weld 平頭開(kāi)口對(duì)接焊縫;平頭開(kāi)口對(duì)接焊open -square butt weld 開(kāi)式工形坡口對(duì)接焊縫square butt weld更多詞組專(zhuān)業(yè)釋義機(jī)械工程無(wú)坡口對(duì)接焊平頭對(duì)接焊縫