在电力的众特性之中，电力系统工程师主要关心的是保持恒定的工作频率。
Of the characteristics of electric power, the primary concern of the electric power system engineers is to maintain a constant operating frequency.
在电力的众特性之中，电力系统工程师主要关心的是保持恒定的工作频率。
Of the characteristics of electric power, the primary concern of the electric power system engineers is to maintain a constant operating frequency.
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