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【单选题】
在转速.电流双闭环调速系统调试中,当转速给定电压增加到额定给定值,而电动机转速低于所要求的额定值,此时应( )。 A.增加转速负反馈电压值 B.减小转速负反馈电压值 C.增加转速调节器输出电压限幅值 D.减小转速调节器输出电压限幅值A.
B.
C.
D.
D
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皮皮学刷刷变学霸
举一反三
【简答题】影响学前儿童健康的生物学因素包括()()()
【单选题】The food is good at this hotel,but the ____ is poor;the waiters don’t seem to be well trained.
A.
maintenance
B.
repair
C.
charge
D.
service
【单选题】The food is good at this hotel, but the_____is poor; the waiters don’t seen to be well trained.
A.
service
B.
repair
C.
charge
D.
maintenance
【单选题】According to the passage, which of the following can be found in the greatest number of different climate areas on Earth?
A.
Reef corals
B.
Penguins
C.
Bears
D.
Camels
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