数字频率计是直接用十进制数字显示被测信号频率的一种测量装置。
The digital frequency meter is a device which is one kind of using decimal system digital directly display the signal frequency.
实验四频率计实验要求：设计一个有效位为4位的十进制的数字频率计。
Experiment iv Cymometer experimental requirements: design of an effective place for the 4 decimal digital frequency meter.
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