聚氨酯橡胶的种类。

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问题:

聚氨酯橡胶的种类。

考点:材料科学橡胶工艺学橡胶工艺学题库
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随着科学技术的进步,我们的生活水平大大提高,同时也产生了一些新的问题。下列做法中错误的是 [ ]

A.为减少大气污染,火力发电厂应采取加高烟囟的办法

B.回收废旧电池,既可节约金属资源又可减少环境污染

C.为减少水污染,工业废水和生活污水一定要处理达标后再排放

D.使用可降解塑料代替传统塑料,有利于减轻“白色污染”

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阅读理解。

     At the middle school level, there are many academic clubs in which students can participate. Students

can choose clubs that focus on an area of interest.

     Mathcounts Club

     Mathcounts tries to increase excitement towards mathematic achievement. It hopes to provide students

with the foundation for success in science, technology, engineering and mathematics careers. Schools select

individuals and teams to participate in competitions. Local competitions are held in February with winners

progressing to state competitions and then on to the national level. Mathcounts works to challenge student's

math skills, develop selfconfidence and give rewards for their achievements.

     Envirothon

     The Envirothon program focuses on natural resources knowledge and exposes students to diverse

environmental issues, ecosystems (生态学). The ecology field competition for five-member middle school

teams offers competitions in wildlife, soil, forestry, and current environmental issues. Students work and

learn in middle school clubs and can compete at the local and state level.

     Future Problem Solvers

     Future Problem Solvers is an academic club that uses a six-step process to solve problems that may

happen in the future. Students who are in the talented and gifted program, who like to"think out of the box",

or who enjoy thinking about futuristic problems may like this club. Teams made up of four students read

future scenes and write up solutions in a booklet using the six-step process. Teams that score high enough

can go to the state competition and then to the international competition.

     Builders Club

     Builders Club is open to any middle school student who wishes to perform community service. Each

Builders Club is co-sponsored (共同捐助) by a Kiwanis club and the middle school. The members learn

by doing, and they learn organization, teamwork, and leadership. Builders Clubs can sponsor a "Teacher

of the Year" program, provide a recycling collection point, organize canned food and clothing drives to

support local shelters.

     Middle school academic clubs offer students a place to explore interests or talents. The clubs they join

in middle school can help guide choices in high school and beyond.

1. Students choosing Mathcounts Club could ____.

A. get help in science careers

B. enjoy solving future problems

C. perform community service

D. study wildlife and soil

2. If you enjoy thinking about futuristic problems, ____ is a good choice for you.

A. Mathcounts Club

B. Builders Club

C. Future Problem Solvers

D. Envirothon

3. The students who are not interested in competitions would like to choose ____.

A. Mathcounts Club

B. Builders Club

C. Future Problem Solvers

D. Envirothon.

4. What is the common feature of the four clubs?

A. Competitions.

B. Leadership.

C. Scientific researches.

D. Exploration of talents.

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如图是事故易发路段标志。

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2004年7月某书店部分图书价格变动情况

下列选项中,价格下降比率最多的图书是()

A.《绩效考核》

B.《商务文书现用现查》

C.《产品开发》

D.《市场营销》

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“城市集中主义”的提出者是法国建筑师()。

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