中央空调化学清洗主要是利用水流的冲刷作用来去除设备和管道中的污染物

阅读理解。

     Eating out is more popular in Britain today than it has ever been. It is reported that British people spend

 more eating out than cooking for themselves and eating at home. It seems that many British people are

 becoming more and more interested in how good their food tastes, and also how healthy it is.

     However, eating out can also be expensive, so British people do not eat out  every night. When having 

 a date with friends, or having a birthday, many people like to go to a restaurant, and people also eat in a

  restaurant before going to the cinema or the theater.

     As in all cultures, there are many rules of manners about eating. The knife and fork should be used in

 the correct way. It is also impolite to speak with your mouth full when you are eating.

     Most British cities have a large collection of food as well as British food, from the very cheap to the

 very expensive: French, Italian, Indian, Chinese, Thai, Japanese and many, many more.

     When people are too tired to cook after work, they often get a "takeaway". This means that they order

 from a take-out restaurant by telephone, and then go to get it. Many take-out restaurants also send it to

 your house. All you have to do is to open the door, pay and eat!

1. When do British people often eat in a restaurant?

    A. After having a birthday.              

    B. Before watching a movie.

    C. When they feel tired.              

    D. If they want to have natural food.

2. Many people prefer to eat out nowadays because _____.

    A. eating out is cheaper than cooking at home

    B. they can learn more manners in the restaurant

    C.people care more about their food than before

    D. people don't like to stay at home after work

3. From the fourth paragraph, we can learn that _____.

    A. British dishes are very expensive

    B. Japanese dishes are most expensive

    C. British people like foreign food

    D. French food is most popular

4. The "takeaway" is the food _____.

    A. you order and take out of the restaurant

    B. that is left when you are eating in a restaurant

    C. you order but don't need to pay at once

    D. that is sold and ordered only on the phone

5. What is the best title (标题) of the passage?

    A. British restaurant culture.                    

    B. British table manners.

    C. Best restaurants in Britain.                    

    D. Best food in Britain.

编写学科课程标准和教材应遵循的原则：思想性和科学性统一；理论联系实际；稳定性和时代性结合：系统性和可接受性结合。(教育学)

常用的 I/O控制方式有________、中断方式、通道方式和________。

重整原料预脱砷一般有哪些方法？各有什么特点？

小管路除外，一般对于常拆管路应采用法兰连接。