The filter takes the main current as a controlled object. Its control circuit is simple.
该电力有源滤波器以主电流为控制对象，控制电路比较简单。
The paper discusses the main current problems in electronic book industry.
本文对我国电子图书产业当前存在的问题进行了反思和探讨。
The paper discusses the main current problems in electronic book industry.
本文对我国电子图书产业当前存在的问题进行了反思和探讨。
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