某同学设计了一个探究电容器所带电荷量与电容器两极间电压关系的实验，实验电路如图6

发布时间：2017-05-19 11:50 │ 来源：www.tikuol.com

题型：选择题

问题：

某同学设计了一个探究电容器所带电荷量与电容器两极间电压关系的实验，实验电路如图6甲所示，其中P为电流传感器，V为电阻很大的电压表。实验时，先将开关S₁闭合，单刀双掷开关S₂掷向a，调节滑动变阻器的滑动头到某位置使电容器C充电，当电路达到稳定后记录理想电压表的示数。再迅速将开关S₂掷向b，使电容器放电。电流传感器P将电容器充、放电过程中的电流数据传送给计算机，在计算机上可显示出电流i随时间t变化的图象如图乙所示。然后改变滑动变阻器滑动头的位置，重复上述步骤，记录多组电流随时间变化的图象和电压表的示数。对于这个实验过程和由图象及数据所得出的结果，下列说法中正确的是（）

A．流过电流传感器P的充电电流和放电电流方向相同

B．图乙中的第①段（充电阶段）电流曲线与横轴所围图形的面积表示电容器充电结束时所带的电荷量

C．电容器充电结束时所带电荷量随电容器充电结束时两极间电压变化的关系图象应为一条过原点的倾斜直线

D．电容器充电结束时所带电荷量与滑动变阻器滑动头的位置无关

考点：实验：伏安法测电阻实验：练习使用示波器实验：测绘小灯泡的伏安特性曲线实验：探究影响导体电阻的因素

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财务管理是企业组织财务活动、处理财务关系的一项针对性很强、单一性的管理工作。 ( )

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完形填空。

     Charlie Chaplin was the first international star of the modern art of movies. He was especially beloved for
his Little Tramp  1 . He was the first screen artist to write,   2 and perform in his own films; in fact, in some
cases, Charlie Chaplin even wrote the music for his movies. He was also the first artist to use his work to pass a   3 of equality and justice ( 正义) for all -   4 for the"little guy". Charlie Chaplin's career and life made  5
the first global icon (偶像); his too-small hat, his too large shoes and his trademark moustache were instantly
recognized by audiences from Chicago to China, from Iowa City to India. And they   6 are today. All of these
make Charlie Chaplin the first citizen of our global village.
     Chaplin, a native of London, was born in   7   on April 16, 1889 to music hall performers. Chaplin only
saw his   8 twice until the age of seven. The man   9 him and his mother about a year after Chaplin was
10 . During Chaplin's earliest years, his mother was a(n)  11 and performer. Then her voice gave out, her
stage career
  12 , and she began actively attending Church of England services. At the age of   13 , Chaplin's mother was
considered as the insane and sent to Cane Hill lunatic asylum (疯人院), and the court sent Charlie and his
brother to live with his father,   14   had by then stopped all payments of child support.
     Charlie Chaplin lived with his father only a short time   15 his mother was released from the lunatic
asylum and then picked up Charlie and his brother, to live with her once again.

(    )1. A. character
(    )2. A. act
(    )3. A. possibility
(    )4. A. generally
(    )5. A. him
(    )6. A. really
(    )7. A. happiness
(    )8. A. brother
(    )9. A. taught
(    )10. A. born
(    )11. A. actor
(    )12. A. ended
(    )13. A. eight
(    )14. A. which
(    )15. A. then

B. behaviour
B. shoot
B. message
B. widely
B. them
B. still
B. luck
B. teacher
B. left
B. young
B. artist
B. began
B. seven
B. what
B. when

C. personality
C. direct
C. culture
C. especially
C. us
C. always
C. poverty
C. mother
C. loved
C. ill
C. dancer
C. broke
C. nine
C. he
C. before

D. gentleman
D. edit
D. promise
D. totally
D. it
D. ever
D. peace
D. father
D. expected
D. old
D. singer
D. continued
D. ten
D. who
D. until

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下位学习包括两种形式∶( )和( )。

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8个月小儿的体重按公式推算应是（）

A.6.5kg

B.7kg

C.7.6kg

D.8.5kg

E.9kg

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下列机械传动中，( )能够自锁。

A．带传动

B．链传动

C．滚珠螺旋传动

D．蜗杆传动

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