煤粉自燃和爆炸的影响因素?

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问题:

煤粉自燃和爆炸的影响因素?

考点:集控值班员考试锅炉运行锅炉运行题库
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     Can you imagine what our life will be like in the year 2050? Perhaps you will be flying off for a holiday on the moon, or maybe you will be taking your dog for a walk in virtual(虚拟的)  reality. We recently

carried out a survey of 1 000 people from different countries to find out what they think life will be like in

the future. The results clearly show both our hopes and fears.

     The survey suggests that friendship-one of the most important human relationships-will have changed

dramatically(显著地) . People will make friends mainly through the Internet. What is more, a large number of people will come across their future wives or husbands in this way! Computers will have become

completely necessary by 2050. Even now, some people begin to regard them as their best friends ! Others, however, say that we will become much more separated and estranged (疏远的)  from each other

because we will have little real human contact.

      Education will have changed a lot, too.  As more and more children will be using computers in schools, certain abilities,  such as mental arithmetic (心算), won't be necessary since there will be computer

programs for most calculations(计算). Even writing by hand-at least to some extent-will have become a

thing of the past.

      According to the survey, home life will be more and more comfortable. Most people believe that by

2050 robots will be doing housework and we will rely mainly on ready-made food. A lot of people tlunk

that we might only cook for fun in the future.

      Space exploration will become increasingly popular. Fifty percent of the people we talked to believe

that man will regularly visit Mars. They also believe that travel on our own planet will probably change.

Almost everyone thinks that there will be no cars in the city center. Some even think that

environmentally-friendly electric of solar-powered cars will have replaced the cars we use now.

       Pollution is something that worries us very much. Some fear that it will continue to get worse, and that it will be impossible for us to live on our polluted planet. Others even foresee that one day we'll have to

pay for clean air.

       On the other hand, people seem to be quite  optimistic about the benefits of genetic engineering, as they think scientists will use it to cure diseases like  cancers and AIDS. If scientists manage to find a cure for

these, we'll have a much healthier society.

       Some people worry about the future, while others  are full of hope and confidence. No matter how

dark or bright it may seem, it is up to us to look after our planet and try to make it a better globe to live on.

1. Many people believe that in 2050, we will         .

A. not pay for computers

B. seldom leave our homes

C. not have any real friends

D. find partners and friends mainly through computers

2. The passage suggests that in 2050         .      

A. half of the world population will have traveled to Mars

B. students wiU write with typewriters only

C. cooking will nqt be easy to people

D.lessons taught at school and the ways in which they are taught will be very different

3. Some people believe that pollution will have           by 2050.     

A. disappeared

B. killed most of the people on the planet

C. become an even worse problem

D. made our planet a warmer place to live on

4. Many people think that by 2050      .      

A. there will be a cure for cancers and AIDS

B. people will have stopped dying

C. scientists will solve all the problems we face

D. people won't get diseases

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在合营企业合营各方的出资方式,只能作为中方的出资方式是()

A.专有技术

B.场地使用权

C.劳务

D.机器设备

题型:问答题 简答题

某单位新建一平面形状为矩形的独立单层建筑物,外墙厚240mm,轴线位于墙中心,檐高2.5m,轴线间距离分别为6.5m和3.2m,该建筑物的建筑面积为()m2。

A.18.53

B.20.80

C.21.98

D.23.19

题型:问答题 简答题

某土层分布如下:第一层填土,厚h1=0.6m,γ1=17kN/m3,第二层粉质黏土,h2=4m,γ2=18kN/m3,ω=22%,ds=2.72,IL=0.5,基础为条形基础,b=2.5m,基础埋深为1.0m,地基承载力特征值fak=140kPa,地下水位为0.6m,用fa=fak+γηb(b-3)+ηdγ0(d-0.5),则地基承载力特征值fa为()kPa。

A.143

B.151.1

C.171.1

D.140

题型:问答题 简答题

从汉赋、元杂剧、明清小说等文学形式的发展繁荣看,中国古代文学发展趋势是()。

A、平民化

B、贵族化

C、神秘化

D、宗教化

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