基本解釋[機(jī)] 無坡口對(duì)接焊 平頭對(duì)接焊縫詞組短語短語open square butt weld 平頭開口對(duì)接焊縫;平頭開口對(duì)接焊open -square butt weld 開式工形坡口對(duì)接焊縫square butt weld更多詞組專業(yè)釋義機(jī)械工程無坡口對(duì)接焊平頭對(duì)接焊縫