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【单选题】
转速负反馈无静差调速系统中转速调节器采用( )。A.
比例调节器
B.
比例积分调节器
C.
微分调节器
D.
调节器
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反馈参考答案：
举一反三
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【单选题】What mistake does Tom’s father make when he sees the prince?
A.
He tells the prince his own name.
B.
He mistakes the prince for his son.
C.
He asks the boy to give him some money.
D.
He tells the man standing nearby to go away.
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【单选题】血中激素浓度极低但生理作用非常明显的原因是( )
A.
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B.
激素的特异性很高
C.
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