【判断题】
发电机低频保护主要用于保护汽轮机，防止汽轮机叶片断裂事故
A. 对
B. 错
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对于配置了两套全线速动保护的220KV密集型电网的线路，带延时的线路后备保护第二段，如果需要，可与相邻线路全线速动保护相配合，按可靠躲过相邻线路出口短路故障整定
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在带电的电压互感器二次回路上工作应采取下列安全措施:1)严格防止电压互感器二次侧短路或接地。工作时应使用绝缘工具，戴手套，必要时,应停用有关保护装置。2)二次侧接临时负载,必须装有专用的刀闸和熔断器
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主保护的双重化主要是指两套主保护的交流电流、电压和直流电源彼此独立；有独立的选相功能；有两套独立的保护专（复）用通道；断路器有两个跳闸线圈，每套主保护分别启动一组
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【单选题】
( ) 33. Why did Natalie Smith pay for the six cars behind her?
A. She had seven tickets.
B. She hoped to please others.
C. She knew the car drivers well.
D. She wanted to show kindness.
A. A
B. B
C. C
D. D
【单选题】
( ) 34. Judy Foreman copied down the phrase because she ___ .
A. thought it was beautifully written
B. wanted to know what it really meant
C. decided to write it on a warehouse wall
D. wanted her husband to put it up in the classroom
A. A
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【单选题】
( ) 35. Who came up with the phrase according to the passage?
A. Judy Foreman. B. Natalie Smith. C. Anne Herbert D. Alice Johnson.
A. A
B. B
C. C
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【单选题】
( ) 36. What can we infer from the last paragraph?
A. People should practice random kindness to those in need.
B. People who receive kindness are likely to offer it to others.
C. People should practice random kindness to strangers they meet.
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A. A
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【单选题】
( ) 37.The greatest river for navigation is ___________.
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( ) 38. From a dam, people can use the water for ___________.
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【单选题】
( ) 39. The water in the river is polluted because of _____________.
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) 1. Even Tony’s six-year-old son asked him ______ smoking.
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2.—What do you think of the lecture of Li Yang’s Crazy English?
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【单选题】
3.—He didn’t go to the lecture this morning, did he?
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【单选题】
13. Her son __________ Coke, but now he __________ milk．
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【单选题】
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20. The schoolboy ______ a blind man cross the street yesterday.
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【单选题】
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【单选题】
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【单选题】
25. — David, look at the man in white over there．Can you tell me _______ ?
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【单选题】
( ) 27. A PENGO WATCH CONTROL can help you to ______________.
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【单选题】
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【单选题】
( ) 29. When was canned food invented?
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A. A
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【单选题】
( ) 30. After the trip to the Arctic, Clarence Birdseye invented ____________.
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【单选题】
( ) 31. Changes in weather _____________ in Willis Carrier's company.
A. helped to keep food B. made rooms comfortable
C. caused health problems D. hurt printing paper
A. A
B. B
C. C
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【单选题】
( ) 32. According to the passage, which of the following may lead to inventions?
A. People's needs. B. Public support.
C. Modern technology. D. Practical suggestions.
A. A
B. B
C. C
D. D
