2002年9月全國(guó)計(jì)算機(jī)等級(jí)考試四級(jí)真題

53. Load factor α of the hash table is approximately
�牐燗）0.28 B）0.35 C）0.54 D）0.71
54. How many key comparisons are needed in searching
for key value 38?
�牐燗）1 B）2 C）3 D）4 
55. Which of the following operations belongs to
message passing?
�牐燗）Read and write B）send and receive
    C）wait and signal D）P and V
56. If file A has the capability of 724,the same
group’s users of file A may do
�牐燗）read A only B）write A
    C）execute A   D）non-operation
57. In which phase of the software engineering process
 is the Software Requirements Specification developed?
�牐燗）Definition phase  B）engineering phase
    C）maintenance phase D）development phase
58. The prototyping method is a dynamic design processs,
which requires people who use prototyping method to have
the following capability of
�牐燗）Proficient program expertise
    B）immediately acquire requirement
    C）coordinate & organize eloquently
    D）handle tools smartly
59. For relation where primary key contains multiple
attributes, no non－key attribute should be functionally
 dependent on a part of primary key. This relation
 R is at least in 
�牐燗）INF B）2NF C）3NF D）BCNF
60. Which of the following statements about object
oriented database is not correct?
�牐燗）Each object has a unique object identify 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 supereloss includes the attributes and methods
      at all subclasses
61. Local bus can increase the data throughput.
 The bus that is most frequently used is
�牐燗）VESA B）EISA C）MCA D）PCI
62. Most frequently used algorithm for page
replacement is 
�牐燗）LRU B）FIFO C） OPT D）PPT
63. The following three concepts are essential to the
OSI model: service, interface and 
�牐燗）Networks B）applications C）protocols D）layers
64. LANs can be connected by using bridges,which
operate in the
�牐燗）Physical layer B）data link layer
    C）network layer  D）transport layer