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【单选题】
The root cause of the maintenance of consumption level despite the high oil price is that ______.
A.
the prices of other products have not been affected
B.
oil takes a smaller proportion of world energy
C.
people are richer to afford expensive products
D.
people are used to living a comfortable life
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A.
空气开关
B.
控制按钮
C.
行程开关
D.
热继电器
【判断题】三相异步电动机正反转控制电路中切换正反转都需要将电机停下来才能切换
A.
正确
B.
错误
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行程开关
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空气开关
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控制按钮
D.
热继电器
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A.
污染物背景浓度小
B.
大气扩散稀释能力强
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人口稀疏
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【单选题】Do Chinese painters strive to present the things of daily reality exactly how they are? Why?
A.
No, they do not, because for Chinese people painting was almost like a magic power that may change our daily reality.
B.
No, they do not, because Daoists do not believe in the importance of daily reality, and try to escape from by drawing imaginary paintings.
C.
Yes, because they are good at observing and imitating the shape of the real world. Thus they always strive for perfection in paintings.
D.
Yes, they do, because Confucianism strongly influenced the art of painting, and they being very pragmatical believed that even paintings one should represent the reality as close as one can.
【多选题】(二)货车驾驶室是由很多总成组成的,从下面的选项中选择出组成驾驶室的部分总成。
A.
地板
B.
前桥
C.
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D.
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C.
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【单选题】三相异步电动机正反转控制电路中切换正反转需要将电机停下来才能切换的是
A.
热继电器互锁
B.
按钮互锁
C.
接触器和按钮双重互锁
D.
接触器互锁
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