短語詞組短語vacuum m brazing furnace 真空釬焊爐large vacuum brazing furnace 大型真空釬接爐vacuum electron beam brazing furnace 真空電子束銅焊爐three -chamber vacuum brazing furnace 三室真空釬焊爐vacuum furnace brazing 定向凝固brazing vacuum furnace 真空釬焊爐 返回 vacuum brazing furnace