短语词组短语spiral -weld steel pipe pile 螺旋电焊钢管桩spiral weld seam 螺旋焊缝spiral weld pipe mill 螺旋焊管机SAW spiral weld pipe 螺旋埋弧焊管conical spiral weld pipe 锥形螺旋焊管spiral weld -pipe mill 螺旋焊管机Spiral weld pipe production line 螺旋焊管生产线 返回 spiral weld