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-impregnated真空浸渍的vacuum sealing block真空密封座vacuum pre-cooling真空预冷vacuum tube register电子管寄存器vacuum cleaning line真空除尘管线vacuum mud-jacking真空压浆vacuum-tube switch真空管开关vacuum keeping fresh真空保鲜vacuum tube generator真空管振荡器vacuum hot-pressing真空热压法