(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 f or 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 
　　C) network layer          D) transport layer

　　(70) TCP service is obtained by having both the sender and the receiver create end points,which are called____．

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