【判断题】【消耗次数：1】
异步电动机空载时的功率因数与满载时比较，前者比后者高。
①
正确
②
错误
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【判断题】
异步电动机的工作特性，是指有电动机在额定电压和额定频率下运行时电动机的转速n、效率η、功率因数cos?、定子电流I1以及输出转矩T2与输出功率P2的关系？
①
正确
②
错误
随机题目
【单选题】
David and Sheila are unable to have children, but they’re hoping to __________ a little boy.
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cultivate
②
raise
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adopt
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acquire
【单选题】
I don’t know why she avoids __________ her opinion on the subject.
①
to give
②
to be given
③
giving
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being given
【单选题】
He told me how he had given me shelter and protection without which I __________ of hunger.
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would be died
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would die
③
would have died
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will die
【单选题】
Candidates are required to ____________ the application form first.
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take in
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put in
③
fill in
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give in
【单选题】
Although Jack made a foolish mistake, we __________ at him.
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ought to have laughed
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oughtn’t to have laughed
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ought to laugh
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should not to laugh
【单选题】
, the sales manager began his report with the statistics of last month’s sales.
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By now
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As usual
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So far
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At most
【单选题】
What can I do for you, madam?
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I want a kilo of apples
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You can go your own way
③
Thanks
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Excuse me. I’m busy
【单选题】
we desire that the tour leader __________ us immediately of any changes in plans.
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inform
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informs
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informed
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has informed
【单选题】
Jack is good, kind, hardworking and intelligent. __________, I can’t speak too highly of him.
①
As a result
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In a word
③
By the way
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On the contrary