单选题:调制解调器(Modem)的功能是(  )。

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题目内容:
调制解调器(Modem)的功能是(  )。 A.将计算机的数字信号转换成模拟信号
B.将模拟信号转换成计算机的数字信号
C.将数字信号与模拟信号互相转换
D.为了上网与接电话两不误

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