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【单选题】
一台三相绕线式异步电动机拖动起重机主钩，当重物提升到一定高度时需要停在空中，若不使用机械制动措施，可以采用的办法是（ ）。A.
对调定子任意两出线端接电源；
B.
降低电动机电源电压；
C.
转子回路串入适当对称电阻；
D.
定子回路串入适当对称电阻。
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反馈参考答案：
举一反三
【单选题】- You look really cool today! - ___________
A.
Thank you.
B.
I am not cool.
C.
No, just so so.
D.
Are you kidding!
【单选题】一I had a great time in Swiss last winter．I went skiing with my friends —Wow! ．
A.
Sounds really cool!
B.
Cheers!
C.
How interesting you are!
D.
I’II go there．too．
【简答题】The water ______ cool when I joined into the pool for morning exercise. A. was felt B. is felt C. felt D. feels
【单选题】Not until my tea became cool______time to drink it.
A.
that I had
B.
had I had
C.
did I have
D.
that I had had
【单选题】— How do you feel? — ________________ [ ]
A.
Yes, I'm cool.
B.
I feel cool.
C.
No, I'm cool.
【简答题】联轴器和( )常用于轴的连接。
【单选题】I bet you’ll look cool and feel cool ________
A.
with something in
B.
with nothing on
C.
in something with
D.
with nothing in
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