单项选择题

()。

A．

B．

C．

D．

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多项选择题

As artists who write about their work, their ________ responsibility in this article is to provide a coherent account of their own practice.
A、principal
B、principle
C、main
D、municipal
E、participal

设开环系统的频率特性，当ω=1rad/s时，其频率特性幅值为（）。(用具体数值表示，不要用分式形式）

答案： 0.5