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【单选题】
已知单位反馈系统的开环传递函数为 ,当输入信号是 时, 系统的稳态误差是 ( )A.
B.
0
C.
20
D.
10
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反馈参考答案：
举一反三
【单选题】一If he________，he __________that food. 一Luckily he was sent to the hospital immediately.
A.
was warned;would not take
B.
had been warned;would not have taken
C.
would be warned; had not taken
D.
would have been warned; had not taken
【单选题】Which combination is most likely to result in the demand for a product being highly price elastic?
A.
B.
C.
D.
D
【单选题】Gen Y expects work environments to be with choices because they highlight______.
A.
immediate feedback
B.
change
C.
customization
D.
participation
【单选题】As the mid-term examination was drawing near,the teachers were busy___________the test papers. [ ]
A.
preparing
B.
preparing for
C.
to prepare
D.
to prepare for
【单选题】which of the following statements is true assuming that demand for a product is price unit elastic:
A.
an increase in price will result in an increase in total revenue
B.
an increase in price will have no effect on total revenue
C.
an increase in price will result in a decline the quantity demanded that is less than the increase in price
D.
an increase in price will result in a decline in total revenue
【单选题】The word 'dirt' in the last sentence refers to ______ .
A.
underlying form. itself
B.
immediate appearance
C.
romantic understanding
D.
motorcycle maintenance
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