题目

在重相同、底面积相等、外形不一样的甲、乙、丙三个容器中，装入同样高h的同一种液体，如图所示，则（ ）A．液体对容器底部的压强和压力都相等B．液体对容器底部的压强和容器对桌面的压强相等C．容器对桌面的压强和压力都相等D．无法确定 答案：容器中装有液体，无论容器的形状如何， （1）液体对容器底的压力和压强，先根据液体压强公式计算压强；然后根据F=PS计算压力． 液体对容器底的压强为：P=ρgh，液体对容器底的压力为：F=PS． （2）容器对水平面的压力和压强，把容器看成固体，先计算容器对水平面的压力，压力等于容器的重力．然   Ma Yan is not really a writer. But this 15-year-old girl has written a book that has moved many people around the world. Ma Vans Diary tells us about Ma's life. She lives in a poor village called Zhangjiashu in Tongxin,Ningxia,and she has no money to go to school. But she is brave and has a strong desire (欲望) to go to school.Her mother gave her diary to a French reporter,Pierre Haski,when he went to Zhangjiashu in 2001. Now it has been published in France,Italy,Germany,Japan and China.  Ma is now a Junior Three student at Yuwang Middle School in Tongxin. But she had to leave school twice before. The first time she had to quit school because her mum told her there was no money for her to go to school. She worked for 21 days and saved 13yuan. With this money she continued her study. The second time,her family told her she had to leave school so her two brothers could have enough money to go to school.  "I want to study," Ma wrote in her diary. "Why can boys study but girls can't? It would be wonderful if I could finish my study at school."  Ma loves school so much because she wants to have a better life.  "My parents work hard in the fields but they are still poor. They have no knowledge. Most girls in my village leave school early and get married young. I don't want that kind of life," Ma said.  After her story became known,many French students sent money to her. Ma's dream is the same as ever. She hopes to go to Tsinghua University and become a reporter. " Then I can find poor kids like me and help them," she said.(   ) 1. Which of the following can describe Ma Yan's character (性格) best?   A. Brave. B. Pretty. C. Lucky. D. Poor.(   ) 2. Now you can find Ma Yans Diary in all the following countries except         .   A. Germany   B. Britain   C. Japan   D. France(   ) 3. Which of the following is the main reason for Ma Yans Diary to be published?   A. Her mother gave her enough money to publish the book.   B. She wrote about the poor life in her village.   C. She is very good at writing.   D. Her diary was read by a French reporter.(   ) 4. Which is the reason for her leaving school for the second time?   A. She had to help her mother do some housework.   B. Her brothers studied better than she did.   C. Girls were not equally treated (平等对待) in their village.   D. She didn't study hard.(   ) 5. Ma Yan wants to study because she wants to         .   A. teach her parents knowledge   B. get more money for her study in Tsinghua University   C. become more famous   D. get more knowledge to change her own life