如何压缩和恢复数据库？

Many people go to school for education. School education is very important and useful, but no one can learn everything from school. A teacher, no matter how much he knows, can't teach his student everything. His work is to show his students how to learn .He teaches them how to read and how to think. So much more is to be learned outside school by students themselves.

It’s always more important to know how to learn by oneself than to learn some facts or formulas(公式) by heart. It’s quite easy to learn some facts in history or a formula in maths, but it’s very difficult to use them. Edison and Einstein didn’t get everything from school, but they were all successful. They invented so many things. The reason for their success is that they knew how to study. They read many books outside school. They worked hard all their lives, wasting not a single moment. The most important thing is that they know how to use their brains（大脑）.

小题1:Students can’t learn everything in school because _____________.

A．the teacher doesn’t know much

B．the teacher can only teach them how to read and write

C．the teacher would not like to teach

D．there are still many things for the students to learn outside小题2:A teacher’s work is _________________

A．to teach all subjects

B．to teach everything

C．to teach the students how to read and think

D．to work hard小题3:To know how to____is much more important than facts or formulas by heart.

A．work out maths problems

B．remember all the facts

C．study science

D．study小题4:Why did the famous scientists become successful ? Because__________

A．they knew how to study

B．they remembered all the formulas

C．they didn’t get everything from school

D．they didn’t know how to use their brains小题5:Which is WRONG according  to the passage?

A．Outside school study is as important as school study

B．It’s more important to know how to learn than only remember some facts and formulas.

C．It’s very easy to use a formula in working out a maths problem.

D．It’s helpful to read more books outside school

在现代化建设中，我党一直强调物质文明和精神文明要一起抓。党的十六大在此基础上提出了建设社会主义政治文明。针对我国经济高速发展过程中存在的突出资源、环境问题，党的十七大报告首次提出“生态文明”，要“基本形成节约能源和保护生态环境的产业结构、增长方式、消费模式”，这是我党科学发展、和谐发展理念的一次升华。

材料是如何体现认识论的有关原理的？(12分)

低钾性碱中毒时，尿液呈酸性的原因为（）。

A.尿中排出过多的NaHCO₃

B.肾小管H⁺和NH₃的生成和排出减少

C.血清钙的减少

D.肾小管排K⁺减少、排H⁺增多

E.以上都是

(37)～(40)题基于“学生-选课-课程”数据库中的3个关系：
S(S#, SNAME, SEX, AGE)，
SC(S#, C#, GRADE)，
C(C#, CNAME, TEACHER)，
它们的主码分别是S#，(S#，C#)，C#

下列关于保持数据完整性的叙述中，不正确的是( )。

A．向关系SC插入元组时，S#和C#都不能是空值(NULL)

B．可以任意删除关系SC中的元组

C．向任何一个关系插入元组时，必须保证关系主码值的唯一性

D．可以任意删除关系C中的元组

资产评估中的资产信息资料的鉴定可通过( )来完成。

A．信息量和信息源的可靠性

B．信息源的可靠性

C．信息源和资料本身的可靠性

D．信息量和信息本身的可靠性