题目内容（请给出正确答案）

[主观题]

Assume that Z（t) = X（t) + Y（t), where X（t) and Y（t) are jointly stationary random processes.

A、Z(t) is a stationary process

B、Sz(f) = Sx(f) + Sy(f)

C、Sz(f) = Sx(f) + Sy(f) + Sxy(f) + Syx(f)

D、If the two processes X(t) and Y(t) are uncorelated and at least one of the processes is zero mean，then Sz(f) = Sx(f) + Sy(f)

提问人：网友adam8616 发布时间：2022-01-07

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