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【单选题】
采用比例调节器的定值调节系统若要减少静态偏差，则需要______。A.
增大比例带
B.
减少放大系数
C.
减小比例带
D.
减少时间常数
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【单选题】2 What do we know about slumber parties? A. They are common in Italy and Finland. B. Teenagers gather for parties at a home and sleep there. C. They are dating clubs for teenage boys and girls. D. It’...
A.
B.
C.
D.
D
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【单选题】Good morning, boys and girls!
A.
Good morning ,Miss Wang!
B.
This is classroom. It’s big!
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