数据库中,数据的物理独立性是指( )。A.数据库与数据库管理系统的相互独立 B.

题型:单项选择题

问题:

数据库中,数据的物理独立性是指( )。

A.数据库与数据库管理系统的相互独立

B.用户程序与DBMS的相互独立

C.用户的应用程序与存储在磁盘上数据库中的数据是相互独立的

D.应用程序与数据库中数据的逻辑结构相互独立

考点:计算机等级考试数据库技术计算机三级(数据库技术)48
题型:单项选择题

假定学生关系是S(S#,SNAME,SEX,AGE),课程关系是C(C#,CNAME,TEACHER),学生选课关系是SC(S#,C#,GRADE),要查找选修"COMPUTER"课程的女学生的姓名,将涉及到关系有( )。

A.S

B.SC,C

C.S,SC

D.S,C,SC

题型:单项选择题

孙中山在《民报》的发刊词中,把同盟会的革命纲领阐发为                                       ,合称为“_______”,它是          的指导思想。

题型:单项选择题

阅读下列材料,回答相关问题。(20分)

材料一 根据西方石油公司估计,下图区域有可能成为21世纪世界能源主要供应地之一。下图是某湖泊沿岸示意图。

材料二 据国家发改委的数字,2009年中国原油产量已超越伊朗成为全球第四大原油生产国;中国石油消费量仅次于美国,位居世界第二位。

中国石油生产量与消费量数据表(单位:亿吨)

(1)根据材料一描述图中湖泊的主要水文特征。(6分)

(2)根据材料一比较图中湖泊南北部湖底坡度差异,并从外力作用方面分析其形成的主要原因。(6分)

(3)指出2001~2009年我国石油消费对进口依赖程度的变化特点是什么?为了维护我国石油安全,你认为有哪些可行的措施?(8分)

题型:单项选择题

以下有一种水果及其产地的连线不符合实际的是[ ]

A、香蕉—台湾

B、苹果—广东

C、柑橘—福建

D、哈密瓜—新疆

题型:单项选择题

阅读理解。

     Tom goes everywhere with Catherine Green, a 54-year-old secretary. He moves around her office at work and goes shopping with her. "Most people don't seem to mind Tom," says Catherine, who thinks he

is wonderful. "He's my fourth child," she says. She may think of him and treat him that way as her son. He moves around buying his food, paying his health bills and his taxes, but in fact Tom is a dog.

      Catherine and Tom live in Sweden, a country where everyone is expected to lead an orderly life

according to rules laid down by the government, which also provides a high level of care for its people.

This level of care costs money.

      People in Sweden pay taxes on everything, so aren't surprised to find that owning a dog means yet

more taxes. Some people are paying as much as 500 Swedish kronor in taxes a year for the right to keep

their dog, money that is spent by the government on dog hospitals and sometimes medical treatment for a

dog that falls ill. However, most such treatment is expensive, so owners often decide to offer health and

even life premium for their dog.

      In Sweden dog owners must pay for any damage their dog does. A Swedish Kennel Club official

explains what this means: if your dog runs out on the road and gets hit by a passing car you, as the owner, have to pay for any damage done to the car, even if your dog has been killed in the accident.

1. Catherine pays taxes for Tom because             .    

A. Tom follows her everywhere            

B. Tom is her child

C. Tom is her dog                        

D. Tom often falls ill

2. The money paid as dog taxes is used to              .  

A. keep a high level of care for the people  

B. pay for damage done by dogs

C. provide medical care for dogs            

D. buy insurance for dog owners

3. The underlined world "premium" possibly means                .  

A. payment for risks                    

B. medical check

C. entertainment expense                

D. protection fee

4. If a dog causes a car accident and gets killed, who should pay for the damage done to the car?       

A. The owner of the car.                

B. The owner of the dog.

C. The insurance company.              

D. The government.

5. From the text it can be inferred that in Sweden             .     

A. dogs are welcome in public places  

B. keeping dogs means asking for trouble

C. many car accidents are caused by dogs    

D. people care much about dogs.

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