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【单选题】
关于电机运行中常发故障的判断，下列不正确的是（）。A.
转子不平衡易造成电机运行过程中振动过大
B.
电机安装的不好或者地基不平，易造成电机不正常的振动和响声
C.
电动机周围环境温度过高，可能造成电机严重过热，这时候可以用水冲一下，冷却
D.
滚动轴承装配不良或者本身又缺陷，易造成电机振动和
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【简答题】Form the sentences. 连词成句。 1. is, for, what, lunch 2. either, I, like, don't, fish 3. lunch, what's, favourite, your, for, food 4. cat, in, we, the, lunch, afternoon
【简答题】What is Macyn ’ s favorite sport and why does she like it?
【单选题】— What about the protection? — Let's keep the surface ________ dirt by putting a cover on it. [ ]
A.
far from
B.
free from
C.
apart from
D.
away from
【单选题】What's the main idea of the second paragraph?______
A.
Fossil energy was once very cheap
B.
Farms in dry areas could get cheap water
C.
Most American farmers used too much fertilizer and pesticide
D.
Mainstream American agriculture used to be wasteful of energy, water and land
【单选题】断路器除满足正常工作条件外,还要求它能可靠地切断最大短路电流。一般用( ) 来表示断路器开断短路电流的能力.
A.
额定极限电流
B.
额定工作电流
C.
额定开断电流
D.
额定冲击电流
【单选题】What is the author's attitude towards finding a job?
A.
People can hardly find a good job facing strong competition today.
B.
Those who me competent and decided will get a good job.
C.
Everybody will get the chance of finding a good job.
D.
Those who don't follow the three stages can hardly find a good job.
【判断题】在“无限大容量的电力系统”中，短路全电流的最大有效值，是短路后第一个周期的短路全电流的有效值，一般用Ish表示，它也可称为短路冲击电流有效值。（ ）
A.
正确
B.
错误
【单选题】—What's the matter with you, Lucy? —After the long walk, my legs ___________ and I couldn't go any farther.
A.
gave off
B.
gave in
C.
gave up
D.
gave out
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