In the 1890s, both Bernard Shaw and Oscar Wilde began writing “problem plays.”
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Shaw was very sensitive to all kinds of social injustice, so his plays are not entertaining.
A. 对
B. 错
当二阶系统特征方程的根为具有负实部的复数根时，系统的阻尼比为
A. ζ<0
B. ζ＝0
C. 0<ζ<1
D. ζ≥1
当输入为单位加速度且系统为单位反馈时，对于I型系统其稳态误差为
A. 0
B. 0.1/k
C. 1/k
D. ∞
下列哪种措施对提高系统的稳定性有效果
A. 增加开环极点
B. 在积分环节外加单位负反馈
C. 增加开环零点
D. 引入串联超前校正装置
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