下面关于模式和实例的说法中,不正确的是A.模式的一个具体值称为模式的一个实例 B.一

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问题:

下面关于模式和实例的说法中,不正确的是

A.模式的一个具体值称为模式的一个实例

B.一个模式对应着一个唯一的实例

C.模式是相对稳定的,实例是相对变动的

D.模式反映的是数据的结构及其联系

考点:计算机等级考试数据库技术三级数据库技术笔试
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The American book Who Moved My Cheese has been a best seller all over the world. It teaches people how to face changes in their lives. It is just for teens. The book tells us that when facing change in our life, like a new school or new friends, don’t be afraid. Use this change to make a better life.

The book gives an example of a change at school. A school is changing from having two terms to three terms because there are too many students. Several teens are talking about this. Most of them are unhappy and worried. But Chris is not. He laughs and tells a story about two mice, two“little people”and some cheese.

The four are in a maze(迷宫)looking for  The cheese. Here, cheese means some thing important in life. But they find the cheese is gone. The mice realize that they can’t change what has happened and have to find more cheese. This means finding different dreams. The little people can’t do this. They are afraid of change so they find no cheese.

After Chris finishes the story, the friends understand one thing:to get more cheese, move in a new direction quickly. His friends understand how this can be used in the changes all teens face, such as doing well at school or feeling good about yourself.

小题1:The book Who Moved My Cheese wants  to teach us_______.

A.how to find the cheese  

B.how to face changes

C.how to make a better life  

D.how to do well in our study小题2:From the story, we can know that finding more cheese means_______.

A.finding more food  

B.finding more friends

C.finding different dreams  

D.feeling good about ourselves小题3:Why does Chris tell the story to his friends?

A.He wants to help his friends out.   

B.He likes telling stories.

C.His friends like listening to stories.

D.His teacher asks him to do so.

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预防或避免呼吸机相关肺炎应特别注意哪项()

A.防止呕吐物吸入

B.把病人安置于隔离病室

C.预防性应用高效、广谱抗生素

D.静脉应用高剂量丙种球蛋白

E.避免使用H2受体阻滞剂,防止胃液pH值升高

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次生矿物

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不适当的治疗措施为

A.卧床休息
B.短期忌盐饮食
C.给予白蛋白
D.合并应用保钾和排钾利尿剂
E.反复多次抽放腹水

题型:单项选择题

某国某一年度进口额为100亿美元,出口额为80亿美元,则下列说法正确的是()。

A.该国贸易顺差20亿美元

B.该国贸易余额20亿美元

C.该国贸易逆差20亿美元

D.上述说法都不对

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