短語詞組短語powder submerged -arc 粉末埋弧焊submerged -arc smelting 埋弧冶煉Submerged -arc welding power 埋弧焊接電源double submerged -arc welding 雙絲埋弧焊multiplewire submerged -arc welding 多絲埋弧焊 返回 submerged arc