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【单选题】
单位负反馈系统的开环传递函数为G（s）=K/（s（0.1s+1）（0.25s+1）），要保证闭环系统稳定，增益K的取值范围为（）。A.
K<0
B.
0
C.
K>14
D.
K=14
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反馈参考答案：
举一反三
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【单选题】Based on the information presented in this selection, a child can best be helped to overcome a fear of riding an escalator by ______.
A.
talking with an adult about why riding an escalator is frightening
B.
watching an adult ride an escalator, being encouraged to try it, and being praised if he or she does
C.
being allowed to avoid escalators until the fear has diminished naturally
D.
watching an adult ride an escalator and receiving verbal assurances from the adult that it is safe
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A.
a, the
B.
the, a
C.
the, /
D.
a, /
【简答题】阅读下面的材料，然后根据材料内容回答所提问题。 You may have known several kinds of police, traffic police and street police. But have you ever heard of energysaving (节能) policemen? A group of 22 of these new policemen went ...
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