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【判断题】
Lb4B1053异步电动机的转差率是指同步转数与转子转速之差。A.
正确
B.
错误
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反馈参考答案：
举一反三
【简答题】城铁电动列车使用的车轮，以踏面的形式分为锥形踏面和（）形踏面两种。
【单选题】The Expo 2010 Shanghai China has been a successful event. If it _____ for one more week, we might have visited all the pavilions. [ ]
A.
continues
B.
had continued
C.
continued
D.
has continued
【简答题】什么是车轮踏面，圆锥形踏面的直径差为多少？
【单选题】_________ is known to us all is that China has launched Shenzhou VII spaceship, ________ made the country's first spacewalk successful.
A.
That; what
B.
What; which
C.
It; which
D.
As; that
【单选题】_______ successful docking of Shenzhou VIII with Tiangong-I means that China has managed to take ________ first important step to establish its own space station.
A.
/; /
B.
A; a
C.
The, a
D.
The; the
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