短語(yǔ)詞組短語(yǔ)butt -welded joint design 對(duì)接接頭設(shè)計(jì)tubular full penetration butt -welded joint 鋼琯相貫銲接節(jié)點(diǎn)single -welded butt joint with back 帶墊板單麪對(duì)接銲 返回 butt-welded joint