It can be classified into two methods of measurements: the time domain measurement and the frequency domain measurement.

某些毫秒级以上的频率变化，只有时域测量才能实现。

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It can be classified into two methods of measurements: the time domain measurement and the frequency domain measurement.

某些毫秒级以上的频率变化，只有时域测量才能实现。

youdao