问题 问答题 简答题

制定拆除爆破总体设计方案需要考虑哪些问题?

答案

参考答案:制定拆除爆破总体设计方案时,应充分调查和考虑下述几个主要问题:

(1)了解建筑物的结构特点和材料构成;

(2)调查相邻近建筑物及设施的状态和地下管线等的分布;

(3)分析建筑物在爆破失稳解体后的塌落或倾倒过程及相应的堆积范围;

(4)预测爆破有害效应对周边环境的不利影响。

填空题
单项选择题

Today more and more people go to websites when looking for information. Although most readers go to websites for news and e-mail, a form of person-to-person news, or in the form of chatting, they also read books on the web. It’s called electronic book (e-book).

Electronic books could revolutionize reading, but people ought to consider their far-reaching impacts as well. "The e-book promises to cause a slow tragedy on life as we know it," Jason Ohler, professor of technology assessment, university of Alaska Southeast In Juneau, warned the World Future Society, Bethesda, Md. His assessment weighed the pros and cons (赞成和反对的理由) of e-book technology’s impact on social relationships, the environment, the economy, etc. Before you curl up (蜷曲) with an e-book, consider the disadvantages.

They increase eyestrain due to poor screen resolution, replace a relatively cheap commodity with a more expensive one, and displace workers in print-book production and traditional publishing. E-books make it easy to share data, thereby threatening copyright agreements and reducing compensation (补偿) of authors, as well as creating nonbiodegradable (不可生物降解) trash.

On the other hand, e-books save paper and trees, reduce the burden of the carrying and storing of printed books, promote self-sufficiency in learning, and make reading a collaborative experience online. They also create new jobs for writers and artists and encourage self-publishing. In final analysis, Ohler points out, e-books should gain society’s approval if a few conditions are met: make them biodegradable and recyclable, solve the problem of eye fatigue, be sure the "have-nots" get the technology, and support e-book training in schools and business.

In what sense do e-books exert a negative impact on the environment().

A. They are unable to be broken down into harmless products.

B. They consume a lot of natural resources.

C. They produce harmful gases.

D. They are capable of being reused.