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【单选题】
低压供电系统中保护接零（中）应用在（）。A.
中点接地的三相四线制
B.
中点不接地的三相三线制
C.
三相四线制或三相三线制
D.
以上都不可以
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举一反三
【单选题】Which of the following is NOT the effect of Aspirin?
A.
It can prevent the risk of heart attacks and strokes.
B.
It can drive away occasional aches and pains.
C.
It can prevent insomnia.
D.
It can induce stomach discomfort.
【单选题】The fiddler crab is like a clock because it changes colour ______.
A.
in a regular 24—hour rhythm
B.
in answer to the sun’s rays
C.
at low tide
D.
every fifty minutes
【单选题】. Not only ________ many people's lives by reducing fever, but _______ other things that aspirin can help with.
A.
aspirin has saved, there also are
B.
has aspirin saved, there are also
C.
aspirin has saved, are there also
D.
has aspirin saved, are there also
【简答题】A wrong way to take aspirin can ______.
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