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【单选题】
交流接触器和按钮组成的控制电路具有( )保护作用A.
短路
B.
过载
C.
零压或欠电压
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【简答题】阅读理解。 Why do we need to throw less away? There are two reasons. One is that some resources (资源) are nonrenewable (不可再生的) That means there is only a certain amount of that resource in the world . One e...
【简答题】Case 2: There are two daughters and their mother. One day two girls wanted to share an orange. Their mother just cut it in half. But these girls weren ’t satisfied and cried. What do you think may be ...
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【单选题】The reason there are two slits, rather than one, in a Young’s experiment is:
A.
to increase the intensity
B.
two slits in parallel offer less resistance
C.
one slit is for frequency, the other for wavelength
D.
to create a path length difference
【单选题】听力原文： Why do people want to save the Whales? There are two important reasons. One reason is that whales help to keep a balance between plants and animals. People have disturbed this balance. People ge...
A.
Because whales keep a balance between plants and animals on land.
B.
Because whales eat a lot of fish.
C.
Because whales eat large amounts of garbage.
D.
Because whales keep oceans clean for fish, and people need fish.
【简答题】第二节：语法填空 There are two main reasons 11 the temperature of the air is always 12 （change）. One reason is that the air around you moves in from somewhere else . Air usually moves in large bo...
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