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发布时间：2006-06-27 07:54     点击：

A) proficient program expertise   B) immediately acquire requirement

C) coordinate & organize eloquently  D) handle tools smartly

(64) For relation R where primary key contains multiple attributes,no non-key attribute should be functionally dependent on a part of the primary key. This relation R is at least in

A) 1NF     　　 B) 2NF  　　   C) 3NF     　　 　 D) BCNF

(65) Which of the following statements about object oriented databse is not correct?

A) Each object has a unique object identity in the system.

B) Encapsulation and inheritance are two important features of object oriented database.

C) A subclass can inherit the attributes and methods of all its superclasses.

D) A subclass includes the attributes and methods of all its subclasses.

(66) Local bus can increase the data throughput. The bus that is most frequently used is

A) VESA   B) EISA　　        C) MCA          D) PCI

(67) Most frequently used algorithm for page replacement is

A) LRU       B) FIFO        C) OPT       D) PPT  

(68) The following three concepts are essential to the OSI model:service,interface and

A) networks         B) applications

C) protocols            D) layers

(69) LANs can be connected by using bridges,which operate in the

A) physical layer          B) data link layer  

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