固定频率源可以在在通讯系统和雷达系统中作为本机振荡器，也可以作为数字电路的基准时钟信号，因此得到了广泛的应用。
Single frequency source is usually used as local oscillator in communication system and radar system, also as a reference clock in digital circuits, so it is a extensive-applied technique.
该晶体振荡器的时钟可用于微控制器的时钟。
The clock of the crystal oscillator can be used for clocking the microcontroller.
在这种情况下，晶体振荡器就不能为设备提供稳定的时钟频率，导致设备工作异常。
In this case, the crystal oscillator can not provide a stable clock frequency, which results in the abnormality of the device.
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