短語詞組短語girth butt weld 環(huán)形對接焊縫girth weld in pipeline 管道環(huán)焊縫girth weld & circumferential 環(huán)形焊縫field girth weld 野外環(huán)向焊縫automatic welding of girth weld 環(huán)形焊縫自動焊接 返回 girth weld