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【判断题】
单闭环速度反馈调速系统，采用PI控制器时，可以保证系统稳态速度误差为零。()A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】Mr. Smith ______working till he was seventy years old.
A.
kept up
B.
kept on
C.
kept to
D.
kept out
【单选题】The price of goods kept ______. We had to cut the expenses in order to meet our daily needs.
A.
standing out
B.
going up
C.
breaking down
D.
putting up
【单选题】如果抽样结果有95%的可信赖程度，则（ ）
A.
抽样结果有5%的可容忍误差
B.
抽样结果有5%的抽样风险
C.
抽样结果有5%的可容忍偏差率
D.
抽样结果有5%的预计总体偏差率
【单选题】The prices of goods kept ____. We had to cut the expenses in order to meet our daily needs.A．stan
A.
19.The prices of goods kept ____. We had to cut the expenses in order to meet our daily needs. A．standing up
B.
breaking down
C.
going up
D.
putting up
【单选题】Goods are kept in our __________ until ready for delivery.
A.
stock
B.
storage
C.
warehouse
【单选题】The prices of goods kept rising, _________ the wages of works kept the same.
A.
consequently
B.
otherwise
C.
whether
D.
whereas
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