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【简答题】
阅读理解。 The holiday shopping season is once again upon us. The super malls and smaller shopping centers will all be packed as hurried Americans search for the perfect gift. The crooks and thieves that prey upon innocent shoppers are well aware of this fact. Even if you don't involve yourself with holiday gift buying, you could end up a victim of theft. Thieves do not distinguish the holiday shopper from the everyday shopper. Thieves only know that there are more potential targets of opportunity at this time of year. They also know that many people are complacent (不以为然的) about personal safety issues year round. They'll factor in the belief that many people take on added stress this time of year while running from store to store with so much to do and so little time to do it. Shoppers who might normally consider personal safety an afterthought push it back even further as they try to negotiate their way through the month of December. College students are not an exception to the rule! As a member of our university community, you're also easily influenced by the dangers of mall shopping this time of year. Take a minute and picture any of the local area malls. Close your eyes and think about the overflowing parking lots and the crowds moving around. The sights, sounds and distractions all can lull you into a state of personal safety complacency. Aside from the shoplifters who steal merchandise from store shelves are the thieves who perpetrate (犯) snatch and grab crimes. And this is the sort of crime that you're most vulnerable to, especially when you find yourself carrying a large number of shopping bags and packages. However, as is the case with most other types of criminal behavior, there are a number of crime prevention measures you can take to lessen or stop your chances of becoming a victim. So take the time to read and then put into practice the following holiday shopping tips. 1. The author is most probably _____. A. a newspaper reporter B. a novelist C. a member of university community D. a police spokesman 2. What does the underlined word 'They' in Paragraph 3 refer to? A. Shoppers. B. Thieves. C. Personal safety issues. D. College students. 3. Why is a person more likely to become a victim of theft during holiday shopping? A. Because he often has much to buy. B. Because he often does shopping in a hurry. C. Because there are crowds of shoppers. D. All of the above. 4. What is the writer's purpose in writing this passage? A. To tell readers different kinds of crimes. B. To make readers aware of holiday shopping dangers. C. To give advice on selecting the perfect gift. D. To introduce American public security situation. 5. Which of the following would be the best title of the passage? A. Holiday Shopping Safety B. Suitable Shopping Places C. Personal Safety During Holidays D. How to Identify a Thief
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【判断题】若PN结两侧的杂质浓度高,则形成的PN结反向漏电流大,反向击穿电压高。()
A.
正确
B.
错误
【判断题】2007年6月,胡锦涛在中央党校发表的重要讲话中指出,科学发展观的基本要求是全面协调可持续发展。
A.
正确
B.
错误
【单选题】PN 结加反向电压时的电流称为 ,这时 PN 结的反向 很大。
A.
反向饱和电流 、 电阻
B.
正向饱和电流、电流
C.
反向饱和电流、电流
D.
正向饱和电流、电阻
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正确
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错误
【判断题】当PN结外加反向电压时,扩散电流小于漂移电流()
A.
正确
B.
错误
【单选题】流过 PN 结的反向电流 ( )。
A.
随温度升高而降低
B.
随反向电压增大而急剧增大
C.
由少子产生
D.
由多子产生
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A.
反向电流与反向电压有关
B.
反向电流和少子的浓度有关
C.
一般锗管的反向电流要高于硅管
D.
反向电流受温度的影响比较大
【判断题】因为地球是一个巨大的物体,所以任何情况下都不能把它看做质点
A.
正确
B.
错误
【简答题】当PN结外加反向电压时,扩散电流______漂移电流。此时,耗尽层______。
【多选题】治疗小儿内伤咳嗽的方剂有:
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杏苏散
B.
二陈汤
C.
清金化痰汤
D.
沙参麦冬汤
E.
六君子汤
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