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【单选题】
_________ 的调速方式可以实现对恒转矩型负载的无极调速。A.
调压调速
B.
串电阻调速
C.
弱磁 调速
D.
调压调速 和 串电阻调速
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【简答题】With more and more cars on the road, the traffic jam will happen. How do we see it and how can we solve the problem? We know that the traffic jam happens in many places, especially in big cities. What...
【单选题】What can we see there?
A.
We can see many beautiful butterflies.
B.
We can see many beautiful birds.
【单选题】How can we specify the meaning of ‘John ran after the man with a gun’?
A.
See if there is a picture.
B.
Ask the speaker to clarify. (e.g. Wait a minute! Who has a gun, John or the man?)
C.
All of the above.
D.
See if there are hints before or after the sentence.
【单选题】------- Now you can see how serious the situation is ! -------- Yes. We _____something before it got so bad .
A.
should do
B.
must do
C.
must have done
D.
ought to have done
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