下列四幅图中,能正确反映分子间作用力f和分子势能EP随分子间距离r变化关系的图线

题型:选择题

问题:

下列四幅图中,能正确反映分子间作用力f和分子势能EP随分子间距离r变化关系的图线是 (  )

A.

B.

C.

D.

考点:分子间的相互作用力分子势能
题型:选择题

There are many kinds of cars in this world. My grandfather thinks this is because cars are like their drivers. He says, “Rich people have expensive cars, big people have large cars, and old people drive old cars.” But I don’t agree with him.

My neighbor, Mrs. Hill, is 82 years old. She drives only on Tuesday, and then she drives only to the bank. She never drives more than 30 kilometers an hour. Do you think Mrs. Hill has a very old and small car? No! Her car is new. It’s very large, and it can go 200 kilometers an hour!

My friend Mike is an artist. He paints beautiful pictures with lots of colors. But his car is black. Mrs. Bates has a very, very old car. It often has some trouble. Does she drive that kind of car because she is poor? No, she has four restaurants and two million dollars in the bank. My uncle Joe has a very small car. Every Sunday, he drives to the country with his wife, his three children, his mother and his dog.

Now, you have read about my friends and their cars. Do you agree with my grandfather? Maybe you have a car. Does it say something about you?

小题1:The writer’s grandfather thinks ___.

A.a person has the same kind of car as himself (herself)

B.different people have cars of the same kind

C.poor people have large cars

D.artists have black cars小题2:Mrs. Bates has an old car ___.

A.because she is poor

B.because she is rich

C.because she likes old cars

D.and the passage doesn’t tell us why小题3:Though Uncle Joe has a very small car, ___.

A.he has a dog

B.he has a large family

C.he has no children

D.he has few members in his family小题4:The writer’s friend Mike paints ___.

A.pictures in black

B.colorful pictures

C.colorless pictures

D.pictures with only a few colors小题5:The writer thinks ___.

A.his grandfather’s idea about cars is right

B.cars are often the same as their drivers in many ways

C.artists shouldn’t drive black cars

D.a car doesn’t say anything about its owner

题型:选择题

计算机辅助系统是计算机应用的一个主要领域,其中CAD的全称是()。

A.计算机辅助设计

B.计算机辅助测试

C.计算机辅助教学

D.计算机辅助制造

题型:选择题

右下6死髓牙,经根管治疗后以金属烤瓷冠修复,在牙体预备取模后和金属烤瓷冠初戴之前,尚需

A.用金属全冠作保护性修复

B.用塑料全冠作保护性修复

C.制作间隙保护器

D.不作任何处理

E.用牙龈保护剂保护牙龈

题型:选择题

变截面轴向拉压杆最大正应力发生的截面上一定是()。

A.轴力N最大

B.横截面积最小

C.轴力N与该截面面积的比值最大

D.轴力N最小

题型:选择题

下图是某县政府在2002年和2007年开县长办公会的主要内容及次数统计(横坐标为开会主要内容,纵坐标为开会次数)。

注:1.研究招商引资问题

2.研究社会治安

3.集体学习

4.研究低保和环保问题

5.研究土地利用及征地补偿问题

6.研究公路改造和基础设施建设问题

如果从内容和次数来判断县政府的行为,应该得出的合理结论是()。

A.转变政府职能,适应新形势发展

B.政府精简会议,提高效率

C.政府的政治职能得到强化

D.不断建设和完善服务型政府

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