vacuum tube powermeter

例句：

1. 1. The vacuum tube powermeter was used to measure the power consumption of the electronic device.
   真空管功率计被用来测量电子设备的功耗。
2. 2. The vacuum tube powermeter was used to monitor the performance of the electric motor.
   真空管功率计被用来监测电动机的性能。
3. 3. The vacuum tube powermeter was used to detect the presence of gases in the air.
   真空管功率计被用来检测空气中的气体存在。