【单选题】【消耗次数：1】
谐振频率可以是流量脉动频率的2倍、3倍或更大。该说法（ ）
①
正确
②
错误
参考答案：
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【判断题】
为减少机械传动部件的扭矩反馈对电机动态性能的影响，机械传动系统的基本固有频率应低于电气驱动部件的固有频率的2~3倍，同时，传动系统的固有频率应接近控制系统的工作频率，以免系统产生振荡而失去稳定性。
①
正确
②
错误
随机题目
【单选题】
That probably explains why public opinion is broadly __________ euthanasia (安乐死), or at least certain forms of it.
①
in relation to
②
in contrast to
③
in excess of
④
in favor of
【单选题】
Young children often can’t __________ between TV programs and commercials.
①
separate
②
distinguish
③
compare
④
contrast
【单选题】
Alice is a __________ person and never makes any unreasonable demands.
①
sensible
②
sensitive
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severe
④
solemn
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People are spending more of their income on goods such as cars and household ________ .
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facilities
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appliances
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instruments
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equipment
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As you know, when college students __________ their future employment, they often think of status and income.
①
apply
②
demand
③
anticipate
④
suppose
【单选题】
David and Sheila are unable to have children, but they’re hoping to __________ a little boy.
①
cultivate
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raise
③
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
④
being given
【单选题】
He told me how he had given me shelter and protection without which I __________ of hunger.
①
would be died
②
would die
③
would have died
④
will die
【单选题】
Candidates are required to ____________ the application form first.
①
take in
②
put in
③
fill in
④
give in
【单选题】
Although Jack made a foolish mistake, we __________ at him.
①
ought to have laughed
②
oughtn’t to have laughed
③
ought to laugh
④
should not to laugh