vacuum gap真空间隙vacuumn.真空；真空吸尘器；空白adj.产生（利用）真空的v.用吸尘器打扫vacuum conveyer tube真空输送管vacuum flash chamber减压闪蒸室vacuum tube emission电子管发射vacuum roller powder真空滚筒干燥粉vacuum pressure pump真空压力泵vacuum control valve真空控制阀vacuum leak detector真空检漏器vacuum copy-holder真空晒相架Vacuum brake booster真空刹车增压器vacuum thermobalance真空热天平