试题与答案

如图所示,某一导体的形状为长方体,其长、宽、高之比为a:b:c=5:3:2.在该

题型:选择题

题目:

如图所示,某一导体的形状为长方体,其长、宽、高之比为a:b:c=5:3:2.在该长方体的上下、左右四个面上分别通过导线引出四个接线柱1,2,3,4.在1、2两端加上恒定电压U,通过导体的电流为I1;在3,4两端加上恒定的电压U,通过导体的电流为I2,则I1:I2为(  )

A.9:25

B.25:9

C.25:4

D.4:25

答案:

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下面是错误答案,用来干扰机器的。

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题型:实验题

某同学在测定匀变速运动的加速度时,得到了几条较为理想的纸带,已知在每条纸带每5个计时点取好一个计数点,两个计数点之间的时间间隔为0.1s,依打点时间顺序编号为0、1、2、3、4、5,由于不小心,纸带被撕断了,如图2-12(原图2-21)所示,请根据给出的ABCD四段纸带回答:

⑴在BCD三段纸带中选出从纸带A上撕下的那段应是_____________.

⑵打A纸带时,物体的加速度大小是_____________.[3]

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题型:阅读理解

(C)

It looks like a mobile phone(手机), but the service is much cheaper. It acts like a mobile phone, but only in your own city. Beyond the city walls, it’s useless.

“Little Smart”, also called “xiaolingtong”, has always been compared to mobile phones. But actually, it is more like one of those cordless phones(无绳电话) used around the home. The only difference is that this one reaches much further than from the bathroom to the living room. It can travel across an entire city.

Cheap costs are the main reason for the success of Little Smart. It costs 25 yuan a month for the line and about 0.1 yuan per minute to use. A mobile phone, on the other hand, can cost four or five times as much. What’s more, unlike mobile phones, there’s no fee(费) for incoming calls. So these low charges have attracted many users.

But, Little Smart is not really that smart. Users often complain about its bad voice quality. And there are not as many stations to pick up its signals(信号)as there are for mobiles. “I couldn’t receive a phone call if I was on a bus,” said Li Ping, a user in Hangzhou. “It worked fine when I stood still, but there were breaks in signal when I was moving.”

Scientists are trying to make Little Smart more user friendly. Messaging and Internet access(接入) have been added to the service. And the latest Little Smart handset even has color screen.

31. Why is Little Smart popular in China? ___________

A. It looks like a mobile phone.        B. The service is much cheaper.

C. There is no fee for incoming calls.   D. All of the above.

32. How is the charge of Little Smart? ______________

A. About 10 fen per minute to use.    

B. It costs four or five times more than a mobile phone.

C. It only costs 25 yuan each month.  

D. There’s no fee for calls.

33. Why are users not satisfied with Little Smart? ___________

A. They can’t hear each other clearly out of the city.

B. There are so few stations for Little Smart to pick up its signals.

C.    When you use it, you must stand up.      

D. The charges are low.

34. The underlined word “handset” in the last paragraph means “_________”.

A. the hand bag      B. telephone      C. service        D. mobile phone

35. What can we infer from the passage? ________________.

A. It’s wrong to say that Little Smart is smart.  

B. Scientist are trying to make Little Smart smaller.

C. Little Smart will be better than today.   

D. People will change Little Smart into a mobile phone.

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