短語詞組短語tack -welding 點(diǎn)固焊;間斷焊LSAW GYH Tack -Welding Machine 預(yù)焊機(jī)tack welding process 預(yù)焊工藝Tack Welding Machine 合縫預(yù)焊機(jī) 返回 tack welding