计算机的主存储器(内存)用来存储数据和指令,为了实现按地址访问,每个存储单元必须有一

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问题:

计算机的主存储器(内存)用来存储数据和指令,为了实现按地址访问,每个存储单元必须有一个惟一的地址。PC主存储器的编址单位是______。

考点:计算机等级考试PC技术三级PC技术笔试
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当管电压为一定值时,增大管电流,则连续X射线的线质强度和波长将发生()。

A、线质变软,强度变大,波长不变

B、线质不变,强度不变,波长变短

C、线质变硬,强度变大,波长变长

D、线质不变,强度变大,波长不变

题型:填空题

1930年,闽西苏区掀起文化建设热潮,有一首红歌《你追我赶实在忙》唱道:“哥哥栽禾妹送秧,横直疏密要适当,但愿今年多产谷,支援红军打胜仗。”这反映出

A.苏区的农业生产迅速恢复发展起来

B.土地革命调动了农民的生产和革命积极性

C.苏区人民期盼结束内战的美好愿望

D.苏区农民的生活条件得到了根本的改善

题型:填空题

Our chemistry teacher          a better way of working out the problem this morning.

A.caught up with

B.came up with

C.put up with

D.got on with

题型:填空题

一般位置平面在三个投影面上的投影都是比实际形状()的类似形。

A、大

B、小

C、相同

D、无关

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阅读理解。

     Many of us still tend to think that emotions can affect reasonable thought, and sometimes land us in

trouble. But in recent years psychologists have taken quite a different view. Keith Oatley, Professor of

psychology at Glasgow University, is involved in the research which shows the fundamental importance

of emotions.

     He believes we are very ambivalent about them: we think of our emotions as being unreasonable, but

we also consider them as essential to being human. For example, Mr Spock, a character in the television

series Startrek is super-intelligent--and he has no emotions at all! However, he is never made captain of

the spaceship. Maybe, this is because Mr Spock is not the kind of person you can share your feelings

with-a person who shows his emotions.

     As Professor Oatley points out, our emotions have very important functions, for example, fear. If we

cross the road and a car approaches, we usually stop moving or step back. We stop what we are doing,

check what we have done-and pay very careful attention to the environment. The emotion of fear makes

us take this small series of actions which, on average, help preserve our safety.

     On the other hand, if things are going well and small problems come up, we find we can solve them

with the resources we have to hand. As a consequence, we tend to feel happy and usually continue doing

the job.

     Anger is an emotion that tends to occur when someone is preventing us from doing something. Then

this small "kit" of reactions enables us to prepare ourselves to be quite aggressive to that person, or to try

harder, and so on.

     Professor Oatley believes emotions generally occur at these important moments in actions. With fear

and anger our emotions make us decide to start doing something else, while with happiness they "suggest" we continue what we are already doing.

1. What's Keith Oatley's opinion about emotions?

A. They affect reasonable thought.

B. They get us into trouble.

C. They are helpful to us.

D. They are reasonable.

2. What does the underlined part "we are very ambivalent about them" in Paragraph 2 mean?

A. We have contradictory feelings towards emotions.

B. We have similar ideas of emotions.

C. We are quite clear about emotions.

D. We can do nothing about emotions.

3. Which of the following is NOT mentioned in the passage?

A. Fear helps us to be careful about our surroundings.

B. Happiness inspires us to continue what we are doing.

C. Anger may urge us to make greater efforts.

D. Anger tends to do us more harm than good.

4. It can be inferred from the passage that ______.

A. we must control our emotions in daily life

B. emotions play a more important part than we realize

C. positive emotions such as love and joy are good for us

D. negative emotions make us continue what we are doing

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