问题 应用设计题

试根据规定要求作图(8分).

(1)如图(1)所示,一物体AB放住平面镜前,试作出物体AB在平面镜中所成的像。

(2)如图(2)所示,小球在竖直平面内摆动,试画出球摆动到B点时所受力的示意图。

(3)在图(3)中,试标出小磁针的N、S极及磁感线的方向。

(4)将电压表和电流表的符号填入如图(4)所示的电路中的圆圈内。要求:开关S闭合后,小灯泡L1和L2并联,且都能发光。

 

答案

如图所示

题目分析:(1)平面镜所成的像是正立的、等大的虚像,物像关于镜面对称,作图时用虚线,如图(1)所示;(2)小球在B点时受到一个竖直向下的重力和一个沿绳方向向上的拉力作用,如图(2)所示;(3)右手螺旋定则的内空是伸出右手,四指指向螺线管中电流方向,大拇指所指的一端为N极,在磁体的外部,磁感线由N极出发,回到S极,磁极间的相互作用是同名磁极相互排斥,异名磁极相互吸引,如图(3)所示;(4)由题意知,要求:开关S闭合后,小灯泡L1和L2并联,即并列连接,且都能发光,所以甲为电压表,乙为电流表。

阅读理解

阅读理解。

     Mr. Smith gave his wife money every Friday evening. His wife always spent it all on the clothes before

the next Wednesday, so that for the next three days she had no money to spend at all. One day Mr .

smith asked her, "but how did you spend all that money?"she answered, "I don't know."

     So one Friday evening, Mr. Smith gave her money together with an exercise book and a pencil. He

said to his wife, "please write down how you spend the money."

     Next Tuesday, his wife had no money again. Mr. Smith took the exercise book to see how she had

spent it, "I have done what you told me."she said gladly. She had written"Friday, I got 18 pounds from

Mr. smith."on the first page, and on the second page, she wrote, "Tuesday, I have spent it all."

1. Mrs smith always spent all the money             .

A.  the next day      

B. in four days  

C. in a week    

D. in the weekend

2. Mr smith gave his wife an exercise book And a pencil and asked her to             

A. do homework        

B. write down how she spent the money.

C. draw a picture on it    

D. keep it 

3.  Mr. smith gave his wife money               a week.

A. twice      

B. once      

C. three times      

D. four times

4. Mrs. smith was              to do what Mr. Smith asked her to do.

A. sorry      

B. exciting      

C. happy      

D. angry

5. The story tells us that Mrs. Smith was not very              .

A. glad      

B. careful        

C. good        

D. bad

选择题