发生碳堆积的原因、现象及处理办法?

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问题:

发生碳堆积的原因、现象及处理办法?

考点:反应岗晋级考试反应岗晋级考试题库
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用边长15厘米的方砖给教室铺地,需要2000块;如果改用边长25厘米的方砖铺地,需要多少块砖?

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下列物态变化中属于吸热的有(   )

A.冬天,玻璃窗上出现冰花

B.放在衣箱里的樟脑球变小了

C.100℃的水蒸气把人烫伤

D.冬天戴眼镜的同学走进教室,眼镜上出现“小水珠”

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阅读理解。

     My parents influenced us with the concepts of family,faith and patriotism when I was

young.Even though we struggled to make ends meet,they stressed how fortunate we were

to live in a great country with limitless opportunities.

     I got my first real job when I was ten.My dad,Benjamin,injured his back working in a

cardboardbox factory and was retrained as a hairstylist.He rented space in a little mall

 and gave his shop the fancy name of Mr Ben's Coiffure.

     The owner of the shopping center gave Dad a discount on his rent for cleaning the

parking lot three nights a week,which meant getting up at 3 am.To pick up trash,Dad

used a little machine that looked like a lawn mower.Mom and I emptied garbage cans

and picked up litter by hand.It took two to three hours to clean the lot.I'd sleep in the

car on the way home.

     I did this for two years,but the lessons I learned have lasted a lifetime.I acquired

discipline and a strong work morality,and learned at an early age the importance of

balancing life's competing interests-in my case,school,homework and a job.This really

helped during my senior year of high school,when I worked 40 hours a week flipping

hamburgers at a fastfood joint while taking a full load of collegeprep courses.

     The_hard_work_paid_off.I attended the US Military Academy and went on to

receive graduate degrees in law and business from Harvard.Later,I joined a big Los

Angeles law firm and was elected to the California state assembly.In these jobs and in

everything else I've done,I have never forgotten those nights in the parking lot.The

experience taught me that there is dignity in all work and that if people are working to

provide for themselves and their families,that is something we should honor.

1.According to the text,the author thinks________.

A.he is lucky to have many chances to get a job

B.it is difficult to find a job to make ends meet

C.his parents are full of complaint about their life

D.it is not acceptable to live in such bad conditions

2.In order to get a discount on rent,________.

A.his father had to work as a hairstylist

B.his father had to work in a cardboardbox factory

C.they had to clean the parking lot three nights a week

D.his father had to pick up litter by hand three hours a day

3.Which of the following is NOT true of the author?

A.He got the graduate degrees from Harvard.

B.He took a collegeprep courses at high school.

C.He took a parttime job during his senior year.

D.He regretted having worked in the parking lot.

4.What does the underlined sentence "The hard work paid off" mean?

A.The author got a high pay by working hard.

B.The author complained of the hard work.

C.The effort which he made had no effection.

D.The hard work was worthwhile for the author.

5.We can learn from the text that________.

A.it is unimaginable for a child to help his family

B.it is honored to work for one's family as a member

C.it is unnecessary to keep work rules of behaviour

D.the harder the work is,the more interest one shows

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1957年谁研制出第一台γ相机()

A.Cassen

B.Anger

C.Curie

D.DavidKubl

E.YaloW

题型:问答题 论述题

在水准测量中,若后视点A的读数大,前视点B的读数小,则有()

A、A点比B点低

B、A点比B点高

C、A点与B点可能同高

D、A点、B点的高低取决于仪器高度

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