题目内容

下列说法错误的是（）。

A. 两个随机信号的互相关系数的绝对值是小于等于1的。
B. 两个随机信号的互相关函数等于0，说明它们彼此正交。
C. 两个随机信号的互协方差等于0，说明它们彼此无关。
D. 无关和独立是等价的

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