全国计算机等级考试四级含金量-2017年全国计算机等级考试四级笔试试题及答案5

　　(61) If file A has the capability of 724,the same group’s users of file A may do____．
　　A) read A only B) write A C) execute A D) non-operation

　　(62) In which phase of the software engineering process is the Software Requirements Specification developed?____．
　　A) definition phase B) engineering
　　C) maintenance D) development phase

　　(63) The prototyping method is a dynamic design process,which requires people who use prototyping method to have the following capability of____．
　　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 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____．
　　A) network address B）supernet address
　　C) socket D) IP address

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