问题 实验题

如图1所示,是小明同学连接的测电阻R的电路。

(1)电路中有一根导线连接错了,请你在接错的导线上打一个叉,并画出正确的连线。

(2)请在方框内画出对应的电路图。

(3)你知道他的电路图是根据什么原理设计的吗?

答:                                                                                            。

(4)当滑片P在某点时,电压表的示数是3.4V,电流表示数如图2所示,则被测电阻R的阻值是              Ω。

(5)若闭合开关后,发现电流表指针偏转,电压表指针没有偏转,该故障的原因是              。

A.电阻R接线短路

B.电阻R接线断路

C.电源接触不良

D.电流表接线短路

答案

(1)

(2)“略”(3)欧姆定律(或R=U/I)(4) 10Ω (5)A

单项选择题
阅读理解

C

The computer is fast, and never makes a mistake, while people are too slow, and full of mistakes sometimes. That’s what people often say when they talk about computers. For over a quarter of a century, scientists have been making better and better computers. Now a computer can do a lot of everyday jobs wonderfully. It is widely used in factories, hospitals, post office and airports. A computer can report, decide and control in almost every field. Many computer scientists are now thinking of making the computer “think” like a man. With the help of a person, a computer can draw pictures, write music, talk with people, play chess, recognize voice, translate languages and so on. Perhaps computer will one day really think and feel. Do you think the people will be afraid when they find that the computer too clever to listen to and serve the people?

63. A computer is clever because people are _____

A. clever    B. not clever   C. slow  D.making mistakes

64. Which of the following can computers not do now?

A. Draw pictures   B. Talk    C. Invent new things    D.Serve the people

65. What will happen in the future?

A. Most work will be done by the computer.     B. People will no longer use computer.

C. Computers will be used only talk with people.   D. All computers will be put into prison.

66. The passage is written to __________.

A. warn people of the danger of the computer

B. tell people about the computer

C. tell people about computer scientists

D. show how to use the computer

67. The best title for this passage is _________.

A. “Computers”        B. “Computer Scientists”

C. “The Future World”   D. “Talk With Computers”