2017年计算机四级试题,2017年全国计算机四级考试模拟试题与答案
(61)how many equal valuable relation does set E process?( )。
E= {0,1,2}
A) 3 B) 4 C) 5 D) 6
(62)Software Engineering Economy is an effective part of software engineering,
which of the following content is the research content of software engineering
economy?( )。
Ⅰ.Estimation of software development cost
Ⅱ.Earn & Cost analysis of software development
Ⅲ.Adjustment of software development progress
A) Ⅲ only B) Ⅱ and Ⅲ C) Ⅰ and Ⅱ D) all
(63)Which of the following statements is correct?( )。
A) The definition phase results in the Software Requirements Specification.
B) Testing is optional in software life cycle.
C) CASE tools can only aid in the design phase of a software life cycle.
D)A change during a later phase does not require the documentation of all
earlier phases to be updated.
(64)WhatoperationonrelationsR and S produces the relationshown below? ( )。
{tuple│tuple∈R□tuple∈S}
A) Union B) Difference C) Intersection D) Division
(65)Which values are NOT permitted to be part of the primary key? ( )。
A) alpha-numeric characters B) punctuation
C) special characters D) NULL
(66)There are two styles in the evolution of instruction set , that is CISC and
RISC. Which chip belongs to the CISC?( )。
A) SOAR B) VAX-11/780 C)CDC6600 D) IBM RTPC
(67)According to the principle of CRC calculation, given a frame-bit series
M=11100111 and the multiple-term formula, frame-bit series generated by the
CRC G=110011, then the CRC is ( )。
A) 111101 B) 00011 C) 11010011 D) 1101001
(68)The main goals of Networkare sharing computer resources .The resources include
hardware、data and ( )。
A) gateway B) router C) software D) server
(69)According to covering scope , which three classes can computer network be
divided ? ( )。
A)PSN、LAN、WAN B)MAN、LAN、WAN
C)PSN、FAST Ethernet、LAN D)PSN、FAST Ethernet、MAN
(70)In HDLC Protocol , when Supervisory Frame's type code is '00 '. About the
following statements , which is correct .( )。
A)Receive Ready B)Receive not Ready C)Reject D)Selective Reject
一、選擇題
1.A 2.A 3.D 4.A 5.D 6.B 7.A 8.B 9.C 10.A
11.B 12.D 13.A 14.B 15.A 16.C 17.D 18.C 19.D 20.D
21.A 22.A 23.B 24.B 25.C 26.B 27.C 28.A 29.C 30.D
31.C 32.A 33.C 34.B 35.A 36.A 37.C 38.D 39.C 40.A
41.A 42.D 43.B 44.B 45.D 46.A 47.B 48.B 49.C 50.B
51.A 52.A 53.A 54.C 55.D 56.A 57.A 58.D 59.A 60.B
61.C 62.C 63.A 64.C 65.D 66.B 67.B 68.C 69.B 70.A
總結
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