(-8)2012×(0.125)2013=______(-12)-1-2+(π-

题型:填空题

问题:

(-8)2012×(0.125)2013=______
(-
1
2
-1-2+(π-3.14)0-(-2)-3=______.
考点:有理数的乘方
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选择氢原子核作为人体磁共振成像的原子核的理由是().

A.1H是人体中最多的原子核

B.1H约占人体中总原子核数的2/3以上

C.1H的磁化率在人体磁性原子核中是最高的

D.以上都是

E.以上都不是

题型:填空题

除正常照明及事故照明外,还应在工作地点备有相当数量的()以便必要时使用。

题型:填空题

Losing a job or not being able to find one almost always brings unwelcome changes. If you’ve lost a job, the first feeling is often one of shock. On top of the loss of income, many people find the whole routine of their life is shattered, their contact with other people reduced, their ambitions halted and their identity as a worker removed.
There may be good feelings too -- it’s nice to be able to lie in bed in the morning, to spend more time with children, or to have more time to think -- a better job may be just around the comer. But, unless a better job does turn up, chances are the days start getting longer and the time becomes harder to fill. Many people pass through periods of difficulty in sleeping and eating. They feel irritable and depressed, often isolated and lonely.
Despite all these problems, unemployment can be a chance for a fresh start. You can discover that it provides an opportunity to sort out or rethink what you want from life and how best you can get it. You can use the time to plan how to find a new job, learn a new skill, develop your hobbies, see if you can run your own business, do some voluntary work in your community or meet new people. It’s up to you.

According to the passage, possible good feelings include the following EXCEPT being able to ______.

A.have more time to think

B.have a new and better job

C.have more time to visit friends

D.spend more time with children

题型:填空题

发展性研究

题型:填空题

因汽提塔釜温过低引起第二萃取塔顶乙烯基乙炔超标处理方法是()。

A.提高汽提塔釜温

B.增加硅油加入量

C.提高第二萃取塔釜温

D.增加第一萃取塔溶剂量

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