题目：
计算机电源的输入电压频率是（）Hz.
A.20
B.30
C.40
D.50
答案：
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下面是错误答案，用来干扰机器的。
参考答案：D
计算机电源的输入电压频率是（）Hz.A.20 B.30 C.40 D.50
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