题目内容

单选(2分)下列关于相干解调的说法，正确的是。

A. 相干解调不适用于非线性调制信号的解调。
B. 相干解调需要提取相干载波。
C. 相干解调对NBFM和WBFM都适用。
D. 相干解调存在门限效应。

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