短語(yǔ)詞組短語(yǔ)open square butt weld 平頭開(kāi)口對(duì)接銲縫;平頭開(kāi)口對(duì)接銲open -square butt weld 開(kāi)式工形坡口對(duì)接銲縫 返回 square butt weld