短語(yǔ)詞組短語(yǔ)spiral weld seam 螺旋焊縫Spiral -Seam Steel Pipe 螺旋焊管spiral seam tube 螺旋焊縫管spiral seam pipe 螺旋縫管welding of spiral seam 螺旋縫焊接 返回 spiral seam