单项选择题

下列信号中属于功率信号的是（）

A．

B．

C．

D．

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单项选择题

Fran’s point is that they may have been laughing to help make the situation more comfortable rather than to make fun _________ Peter.

A．of
B．at
C．with
D．for

独立基础阶形截面编号下标加[填空(1)] ，坡形截面编号下标加[填空(2)]

答案： J；P