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异步电动机由额定电压、额定频率供电，且无外加电阻和电抗时的机械特性方程式，称作（）特性。
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【简答题】Great British is an island that lies off the northwest coast of Europe. The nearest country is France which is 20 miles away. Great British is separated from France by the English Channel. The island ...
【简答题】“一束X射线照射一个原子列（一维晶体），只有镜面反射方向上才有可能产生衍射线”，此种说法是否正确？
【单选题】Which of the following does not belong to the Island of Great Britain?
A.
England
B.
Scotland
C.
Wales
D.
Ireland
【单选题】Scotland occupies the ______ third of the island of Great Britain in the British Isles.
A.
southern
B.
northern
C.
eastern
D.
western
【单选题】There are ______ political divisions on the island of Great Britain.
A.
one
B.
two
C.
three
D.
four
【多选题】短文还原：In Australia there is a famous island called Fraser Island. A great many visitors come here for holidays every year. Why? The reason is that it is special. (56)__________________. In fact, it is ...
A.
Planes arrive and leave from here
B.
Anyone who breaks the rules will be punished
C.
The island is completely made of sand
D.
Unluckily, visitors have caused many problems
E.
Many kinds of birds and animals live in the forest
F.
So it is time to protect the environment of the island
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