vacuumpumpn.真空泵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 evaporation coating真空镀膜vacuum tube type rectifier电子管整流器vacuum circuit - breaker真空断路器vacuum-power gear change真空助力换挡vacuum can sealing machine真空封罐机vacuum tube millivoltmeter电子管毫伏表vacuum arc furnace melting真空电弧熔化炉Vacuum -sealing drainage封闭负压吸引vacuum impregnation method真空浸渍法vacuum tempering apparatus真空加湿器