2017年全国计算机等级考试四级笔试试题及答案5

2017-06-05 17:41 来源:网络综合
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  (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