题目内容

过阻尼二阶系统的单位阶跃稳态响应为（）

A. 常数
B. 衰减震荡曲线
C. 单调上升曲线
D. 等幅震荡曲线

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简述二阶系统的动态性能随系统阻尼比的变化情况。

A: Excuse me, how can I get to the station?B: _________________.

A. Yes, you can
B. Don’t ask me
C. On foot
D. I’m sorry.

A: May I come in?B: _____________.

A. No, you can’t
B. Yes, please
C. Yes, you are
D. No, you can

A: Anything else I can do for you, sir?B: _______________.

A. Yes, you do
B. No, you do not
C. Yes, you can
D. No, thanks for your help