问题 多选题

如图所示的实验装置为库仑扭秤,细银丝的下端悬挂一根绝缘棒,棒的一端是一个带电的金属小球A,另一端有一个不带电的球B,B与A所受的重力平衡,当把另一个带电的金属球C插于容器并使它靠近A时,A和C之间的作用力使悬丝扭转,通过悬丝扭转的角度可以比较力的大小,便可找到力F与距离r和电量q的关系。这一实验中用到了下列哪些方法

[ ]

A.微小量放大法

B.极限法

C.控制变量法

D.逐差法

答案

AC

完形填空

第二节:完形填空(共10小题;每小题2分,满分20分)

阅读下面短文,掌握其大意,然后从41—50各题所给的四个选项(A、B、C和D)中,选出最佳选项,并在答题卡上将该项涂黑。

In 1962, a Russian woman told her doctor that she could __41_  through her fingers. Certainly the doctor didn’t believe it   42   he saw with his own eyes. The doctor 43  her eyes with a large handkerchief and then put coloured papers and newspapers under her hands. She was able to   44 one colour from another and read the newspaper by   45  and feeling them. The doctor   46  her many times and was   47  with the examination, so he sent her to Moscow, in which she was further examined by   48   . Her unusual powers, in the end, were   49  .

The early research into these unusual powers has shown that  50  man trusts only his eyes, he will not be able to see outside the limits of time and into the space.

41         A. write                    B. draw                    C. sing                     D. see

42         A . after                 B. when          C. until                     D. since

43         A .opened          B. hid                      C .closed                  D. covered

44         A. see            B .guess                   C. tell                      D. think

45         A. seeing          B. singing                 C. touching               D .checking

46         A. saw            B .examined              C. helped                  D. watched

47         A .satisfied                B. strict                  C. busy             D .very careful

48         A. nurses          B. scientists               C .blind people         D. good teachers

49         A. examined           B. believed             C .known                 D. true

50     A. if                    B. whether              C. because              D. after

选择题