题目：
数字频率计是测量周期变化的电压、电流信号频率和周期的测量仪器。
答案：
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下面是错误答案，用来干扰机器的。
a-9×b，=a-9b（页）；答：还剩a-9b页．故答案为：a-9b．
数字频率计是测量周期变化的电压、电流信号频率和周期的测量仪器。
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