短語(yǔ)詞組短語(yǔ)butt joint gap 對(duì)接接頭間隙lapping with butt gap 間隙繞包gap butt 開(kāi)口對(duì)接;明接郃butt welding with no gap tig 填絲無(wú)間隙對(duì)接銲 返回 butt gap