问题 问答题 简答题

在流体力学中,拉格朗曰分析法和欧拉分析法有何区别?

答案

参考答案:

拉格朗曰法着眼于流体中各质点的流动情况跟踪每一个质点观察与分析该质点的运动历程然后综合足够多的质点的运动情况以得到整个流体运动的规律。

欧拉法着眼于流体经过空间各固定点时的运动情况它不过问这些流体运动情况是哪些流体质点表现出来的也不管那些质点的运动历程因此拉格朗曰分析法和欧拉分析法是描述流体的运动形态和方式的两种不同的基本方法。

阅读理解

阅读理解。

     In the world, soccer of football is the most popular sport. This is because many countries have wonderful

teams for the World Cup. The World Cup is held every four years.

     To remember 2002 FIFA World Cup,children from different countries and more than 60 children from

Japanese schools came together and spent three weekends drawing a big picture called "Dream (梦幻) World

Cups" in Japan.The children drew animals, flowers and people playing occer under a blue bright sky. They

wished each football team good luck by drawing the flags (旗帜) of all the countries that will take part in the

World Cup in Japan and South Korea. The picture was put up in a park near a playground in Yokohama. Some

football teams will have games there.

     Are you a football fan (迷)? The World Cup makes more and more people interested in football

Teenagers (青少年) like playing and training football. Many of them love some football stars so much that they

get the pictures of their favorite players on the walls of their rooms. That is the way to show their love for the

World Cup as children in Japan.

1. If a country wants to take part in the World Cup, she must have _____. [ ]

A. Many football fans  

B. a very good team

C. many football player  

D. a big playground

2. The next World Cup will be held in _______. [ ]

A. 2006

B. 2007

C. 2005 

D. 2004

3. From the passage, in the picture children drew many things except _______. [ ]

A. people playing football

B. pictures of some football stars

C. a sunny sky

D. flowers

4. In "Dream World Cup", the children drew the flags of some countries ______. [ ]

A. to show their love for their own country

B. to tell the people their stories

C. to show their good wishes for the football teams

D. to show their new ideas about football

5. Many teenagers own the pictures of some football stars because ______. [ ]

A. they are interested in football 

B. they are football fans

C. they think their favorite players are great 

D. all of A, B an

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