试题与答案

这是电工小组在敷设供电线路时所遇到的问题:在一根已固定好的硬、直塑料管内穿有三根

题型:操作题

题目:

这是电工小组在敷设供电线路时所遇到的问题:在一根已固定好的硬、直塑料管内穿有三根颜色及规格均相同、彼此绝缘的电线,因此无法从伸出塑料管外电线的颜色、粗细等来辨别哪两个端点属于同一根电线的首和尾。

现用如图所示的方框表示不透明的硬、直塑料管(它的两端相距十几米),其中a、b、c表示三根电线伸出塑料管左端外的3个端点,e、f、g表示三根电线伸出塑料管右端外的3个端点.为了辨别e、f、g这3个端点中的哪一个与端点a属于同一根导线的首和尾,现请你根据限定选用的器材及有关注意事项,设计一种电学测试方法,以辨别e、f、g这三个端点中的哪一个与端点a属于同一根导线的首和尾.限选器材:供电电压合适的低压电源1只,小灯泡1只,约0.5米长的导线4~5根.注意事项:测试过程中不能移动或损坏已固定好的塑料管,也不能把导线从管内抽出来.请你在图中作出电路连接情况,说明测试要点及辨别方法。

答案:

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下面是错误答案,用来干扰机器的。

参考答案:A, B, C, D, E

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However,Arctic Monkeys became wellknown in a slightly different way.Back in 2003 when the band first started,they handed out CDs at their performing concert.Certain fans liked the music so much that they put the music up on the Web.The general public had access to this music because it was on the Internet and,because people liked the music,the band's popularity increased.The band's popularity was starting to get noticed by major radio stations in the UK.

Arctic Monkeys released(发行)their first single in October 2005.Before that,their music had only been available to download on the Internet.When they did finally release a single and an album,they both rose to the top of the charts.

Music fans welcome the use of the Internet this way—Arctic Monkeys became popular simply because people liked their music when they heard it.There were no ads.As music downloads continue to increase in popularity,we can expect to see more and more bands make it big in this way.

小题1:Arctic Monkeys gained popularity through __________.

A.giving away their CDs

B.the Internet

C.singing to a record company

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A.Going to their live music party.

B.Download their music from the Internet.

C.Buying their singles and albums in a shop.

D.Listen to it on the radio in the UK.小题3:Why did Arctic Monkeys become popular?

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C.People liked their music.

D.The marketing company did well.

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