题目内容

老牛为什么不开心？

A. it has been cheated
B. it was dumped
C. it is played
D. it was fired

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I'm really ()out

I just want some () and quiet

PDM指的是（）。

A. 脉幅调制
B. 脉宽调制
C. 脉位调制
D. 脉频调制

量化器的性能一般采用（）来衡量。

A. 量化噪声
B. 量化误差
C. 量化信噪比