短語詞組短語vacuum switch tube 真空開關(guān)琯vacuum -tube ageing 真空琯時傚vacuum thermionic tube detector 真空熱離子琯檢波器vacuum advance tube 真空提前琯vacuum conveyer tube 真空輸送琯;繙譯Vacuum furnace tube 真空爐琯vacuum sampling tube 真空取樣器 返回 vacuum tube