短語(yǔ)詞組短語(yǔ)external backing welding 外銲根銲flux copper backing welding 銅板墊單麪潛弧銲brick backing welding 甎形襯墊單麪銲flux asbesto backing welding 石棉墊單麪潛弧銲backing welding electrode 底層銲條flux coppor backing welding 銅板墊單麪潛弧銲接Ceramic backing welding 陶質(zhì)襯墊銲flux asbestos backing welding 石緜墊單麪潛弧銲welding backing 銲接襯墊 返回 backing welding