短語詞組短語backing g weld 用墊環(huán)的焊縫backing groove of weld 焊縫反面坡口weld backing 焊接襯墊;焊縫襯墊;焊縫墊;焊縫背襯墊nonfusible weld backing 非熔性焊接背墊weld with backing ring 背面墊環(huán)焊接weld with backing strip 背面墊板條焊接 返回 backing weld