If a review of the frequency distributions for each source points to a many-to-one condition and one source has only unique values, then it is a likely reference source.

如果查看每个源的频率分布发现存在多对一的情况，并且一个源只有一个惟一的值，那么它很可能就是引用源。

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Through collecting vibration signal and analyzing it in the frequency domain in the condition of changing parameter cutting, a single self power spectrum is hard to detect tool breakage effectively.

在变切削参数的加工工况下，通过对振动信号的采集和频域处理，发现采用单一的自功率谱方法难以有效检测出刀片破损。

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This circuit has both characters of restricting the current within the giving value and limiting the switching frequency of MOSFET operating on current limited condition.

该电路具有既能将负载电流限制在设定值以内，又能控制限流工作时功率管的开关频率等特点。

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Ranger IV was also equipped with a seismometer and radio transmitter, designed to be released in a small capsule from the rocket before impact and land on the Moon in sufficiently good condition to measure the frequency of natural earthquakes in the body of the Moon.

BBC: 1962: First US rocket lands on Moon