试题与答案

设函数f(x)在[0,+∞]上连续,且f(0)>0,已知其在[0,x]上的平均值等于

题型:问答题

题目:

设函数f(x)在[0,+∞]上连续,且f(0)>0,已知其在[0,x]上的平均值等于f(0)与f(x)的几何平均值,求f(x).

答案:

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D. For two years and a half.

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A. By train.  

B. By ship.  

C. by plane.    

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3. Why did the girl ask the policeman?

A. Because she couldn't speak-English.

B . Because she wanted to know the way to the hotel.

C. Because she lost her things.

D. Because she was afraid in a new place.

4. Why was the girl surprised in that city?

A. The policeman didn't understand her at all.

B. She couldn't speak English freely.

C. The policeman under-stood her at last.

D. She asked the same question again and again.

5. What can we learn from the story?

A. The policeman spoke bad English. The girl's English was not good enough.

B. The policeman didn't know the way to the hotel.

C. The girl's English was not good enough.

D. 'There are no good teachers in Japan.

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小明同学在探究“压力的作用效果与压力大小的关系”时,做了如下图甲、乙所示的实验。

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