电能计量装置
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electrical energy measurement devices 电能计量装置
Methods OF MEASUREMENT: it's imperative to have methods (devices) by which energy usage can be monitored. This can be achieved via permanently installed or by portable devices.
测量方法：一定的能耗监测装置是必需的，可以通过安装永久的或利用便携式的装置来达到监测目的。
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