问题 问答题 论述题

从离子交换器的结构说明逆流和顺流方式在操作中有何不同?

答案

参考答案:

顺流离子交换器和逆流离子交换器的出入水装置基本相同,二者主要区别是时再生液的装置不同,由此也决定了其再生方式是不同的。顺流再生离子交换器进再生液装置是在交换器的上部,靠近树脂层面;在直径较小的交换器中,往往将进水装置与再生液装置合二分一,再生时,再生液与水流方向相同。逆流离子交换器进再生液装置一般在树脂层内,进再生液装置上有压脂层,再生时,用来排除废液、上部压脂层的冲洗水或顶压用的压缩空气。由于再生方式不同,顺流式床体每个工作周期均人反洗。

阅读理解

阅读理解

       Britain's first eco-friendly(环保的) nightclub has opened in London. It is good for the environment

and can be a lot of fun!

       The party people dance on a special dance floor. The floor can produce the electricity for the club

to play music. The more you dance, the more electricity can be produced. Such a dance floor could

produce about 60% of the building's electricity.

       The entry fee is £10, but people who go there by bike, by public transport or on foot can enter for

free. The club is run by a very rich man, Andrew King. Mr. King is also running a new organization called Club Climate (气候). It is working on climate change. He hopes to call on more young people to help to

save the planet.

       The club is a new thing for young people. It is also different from other "grown-up" charities. "There

is no greater place than a club to reach out to young people," said Mr. King. "Having a dance floor to

produce electricity is a very exciting and interesting idea."

       Besides the floor, scientists say that some people have invented a new kind of clothing that can also

produce electricity. When people wear the clothes, all their movements are changed into electricity.

根据短文内容,选择最佳答案

1. Where can you find an eco-friendly nightclub?                                                                        

A. In the USA.    

B. In France.    

C. In the UK.  

D. In Canada.

2. How much should you pay for the entry fee if you go to the eco-friendly nightclub by bus?

A. £10.

B. £6.

C. 60% of the price.

D. Nothing.

3. What did Mr. King open the club for?

A. Producing electricity.

B. Helping to save the planet.

C. Dancing on the floor.

D. Making money for charity.

4. What does the word "run" in the passage mean?

A. 经营.

B. 奔跑.

C. 组织.

D. 控制.

5. Which of the following is NOT right according to the passage?

A. The special dance floor can produce about 60% of the building's electricity.

B. Andrew King has managed two clubs for protecting the environment.

C. Only dancing with a new kind of clothing can produce electricity.

D. Young people can have a lot of fun in Mr. King's club.

判断题