在实验室进行周期信号分析时，通常使用选频电平表来测量其频谱。
When periodic signals are analyzed in the laboratory, we measure the frequency spectrum of signals usually by a selection level meter.
在实验室进行周期信号分析时，通常使用选频电平表来测量其频谱。
When periodic signals are analyzed in the laboratory, we measure the frequency spectrum of signals usually by a selection level meter.
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