一束自然光自空气射向一块平板玻璃(见图2-3-5),设入射角等于布儒斯特角I0,则在

题型:单项选择题

问题:

一束自然光自空气射向一块平板玻璃(见图2-3-5),设入射角等于布儒斯特角I0,则在界面2的反射光()。

A.是自然光

B.是完全偏振光且光矢量的振动方向垂直于入射面

C.是完全偏振光且光矢量的振动方向平行于入射面

D.是部分偏振光

考点:注册土木工程师岩土工程基础知识基础知识
题型:单项选择题

阅读理解。

     The British Museum is the biggest museum in the world. Inside, you feel smaller than usual. There are many things to see.

     The story of the British Museum goes back three hundred years to one unusual man, Sir Hans Sloane, doctor to King George II. The doctor collected books, drawings, clothes, money, animals, flowers, things

from all over the world. The doctor wanted everything to stay together when he died, so that people could come and have a look. The British Museum began. King George II gave his library, and the museum started to grow.

     The British Museum opened in 1759, six years after Sir Hans Sloane died. At first the museum was

only open three days a week and only ten people could enter in an hour. There wasn’t much time to see

things. Visitors had to run though the rooms.

     By about 1800, things began to get better. Wonderful statues, three thousand years old, arrived from

Egypt. King George IV sold all his books to the museum secretly. A hundred years ago not only old books but also new ones arrived at the museum, and more people came to read them. Since them many famous men have written and studied there. And the library is growing faster and faster. There are four kilometers of new shelves every year and there are about two million visitors every year.

1. Sir Hans Sloane was interested in ______.

A. collecting all kinds of books  

B. collecting all kinds of drawings

C. collecting all kinds of money  

D. collecting all kinds of things

2. When you go inside the British Museum, you feel smaller than usual because ______.

A. the museum is empty      

B. the museum is very big

C. there are too many things in it  

D. you are too small

3. Sir Hans Sloane died ______.

A. in 1753  

B. in 1759  

C. in 1765  

D. in 1800

4. At first, the visitors had to run through the museum because ______.

A. there are only several things to see              

B. the museum was the biggest one in the world

C. they were not interested in the things in it        

D. they had only one hour to see all the things in it

5. The passage is mainly about ______.

A. Sir Hans Sloane             

B. George II    

C. the history of British Museum  

D. the books in the museum              

题型:单项选择题

如图所示,皮带始终保持v=6m/s的速度顺时针运转,一个质量为m=1.0kg、初速度为零的小物体放在传送带的左端,若物体与传送带之间的动摩擦因数μ=0.15,传送带左右两端距离为s=6.75m.(g取10m/s2

(1)求物体从左端运动到右端的时间;

(2)设皮带轮由电动机带动,求物体在皮带上从左端运动到右端消耗的电能.

题型:单项选择题

线段CD是由线段AB平移得到的。点A(-1,4)的对应点为C(4,7),则点B(- 4,- 1)的对应点D的坐标为[ ]

A.(2,9)

B.(5,3)

C.(1,2)

D.(- 9,- 4)

题型:单项选择题

下面程序段的运行结果是( )。  voidmain( )  {    ihtt,a,b,C;    a=1;b=2;C=2;    while(a<b<c)    {t=a;a=b;b=t;c--;}    cout<<a<<","<<b<<","<<C;  }

A.1,2,0

B.2,1,0

C.1,2,1

D.2,1,1

题型:单项选择题

简述人类劳动与动物本能的区别。

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