问题 问答题 简答题

局部排气净化系统设计的基本内容

答案

参考答案:

(1)捕集装置设计:集气罩结构形式、安装位置以及性能参数确定等。

(2)净化系统的选择或设计①选择依据A.污染物的种类与性质;B.处理量;C.净化效率;D.净化系统的环境、经济及社会效益。②一般程序A.工程调查;B.确定净化程度;C.选择合理的净化工艺;D.选择适当的净化装置,确定合理的净化系统配置;E.确定净化系统运行参数和技术经济指标。③除尘系统与装置的选择;④吸收系统与装置的选择;⑤吸附系统与吸附装置的选择⑥净化装置的费用:设备投资费、运行费用、总费用

(3)管道系统的设计:管道布置、管道内气体流速的确定、管径选择、压力损失计算以及通风机选择

(4)排放烟囱设计:烟囱高度、出口直径、排气速度等。

阅读理解

阅读理解。

     The pupils of the remote Beau-Roc primary school in Haiti are chanting. One of them plays a guitar made

from an empty oil tin. Their headmistress, Emile Jean-Noel, is one of the few women school headteachers in

the country.

     Today, over 70% of Haitian population live without proper food, water, schools, or housing. To reduce the

hunger that prevents learning and to encourage parents to send their children to school, meals are provided by

the World Food Programme.

     "We are so cut off that we have many difficulties," comments Emile, adding that finding chalk, school books

and other materials is practically impossible. Entile tries to encourage people around her to make use of available

resources. Her efforts are bearing fruit. One of her successes was convincing local women to contribute to

their children's schooling and increase their income by selling embroidery (刺绣) and other handicrafts.

     Recent political instability has meant that the country has not invested (投资) in education for ten years.

Only 44% of children go to school and less than half of them finish primary school. Less than a third of these

children go on to secondary school. In rural areas it is not rare to find 17 and 18 year olds in primary school-

Beau-Roc has only 4 teachers for 260 pupils. Emile works constantly to improve her pupils' environment.

Under her direction, a local worker is now constructing a store house for the food delivered regularly by the

WFP.

     Not only is Emile's salary small, but she receives it irregularly. For her, transport is a real headache. She

lives five kilometers away and has to take the tap, a privately-owned bus, costing more than she can afford.

     "The decision to be a rural teacher in Haiti should not be taken lightly", Emile comments. "With all the

sacrifices and risks it requires, only those who are really cut out for teaching should do it." However, Emile

loves her job. "I always feel at home with the children and, because the parents understand what I'm doing,

I try to give my best."

1. Which of the following is extremely difficult for Beau-Roc primary school?

A. Teaching the women how to make embroidery and other handicrafts.

B. Persuading local women to care about their children' s education.

C. Encouraging people around to use those available resources.

D. Finding chalk, school books and other materials.

2. The many figures in Paragraph 4 indicate _____.

A. poor investment in Haitian education

B. political instability in Haiti

C. challenges in Emile's life

D. Emile's constant efforts

3. In the last paragraph, "those who are really cut out for teaching" refer to people who are _____.

A. dismissed from teaching

B. unfamiliar with teaching

C. qualified for teaching

D. cautious about teaching

4. What topic is presented in this passage?

A. Hardship for teachers.

B. Devotion to education.

C. Politics and children.

D. Love and beauty.

单项选择题