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【单选题】
在传染病感染过程中最常见的是:A.
病原体被清除
B.
隐性感染
C.
显性感染
D.
病原携带状态
E.
潜在性感染
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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
【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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