历年计算机等级考试四级一9,标签：计算机四级考试真题,计算机考试题库,http://www.dxs56.com
(76)Which operating system can Oracle database NOT be used in？
A)DOS B)UNIX C)Windows95 D)IBM Mainframes
(77)Which values are NOT permitted to be part of the primary key？
A)NULL B)punctuation 
C)special characters D)alpha——numeric characters
(78)Which phase of the software engineering process results in the
Software Requirements Specification？
A)definition phase B)engineering phase
C)maintenance phase D)development phase
(79)When drawing multilevel data flow chart of top——down,the balance
between parent chart and son chart must be taken into account,and to
pass judgment for the balance of the charts is regularly maintained by
(2 grades)
A)Output data B)Data dictionary
C)Processing number D)Input data
(80)Which is the strictest form of cohesion？
A)logical B)functional C)procedural D)coincidental
(81)Which is NOT a concept of White Box Testing？(2 grades)
A)You should execute all loops at their boundary conditions
B)You should execute all interfaces at their boundary co  nditions.
C)You should execute all logical decisions on their true and false
sides.
D)You should execute all independent paths within a module at
least once.
(82)Prototyping method is a dynamic design process,it requires people
who use prototyping method should have the following capability
A)Proficient program expertise
B)Immediately acquire requirement
C)Coordinate &organize eloquently
D)Handle tools smartly
(83)There are two styles in the evolution of instruction set ，that is
CISC and RISC.Which chip belongs to the RISC？
A)i APX 432 B)VAX——11/780 
C)Motorola 68000 D)Power PC 
(84)In advanced PC bus or local bus,which one has the fastest data
throughput？
A)ISA B)PCI C)MCA D)EISA
(85)There are many methods in the CPETT(short for Computer Performance
Evaluation Tools and Techniques)。One of them is the method that runs a
Kernel as the load of a computer.So we call it
A)Monitor method B)Benchmark method
C)Model method D)Physical method
(86)There are two common types in page replacement algorithm:stack and
non——stack strategies.When a real page number increase only stack
algorithm can increase the hit rate monotonously.In the following
replacement algorithm,which one belongs to non——stack strategy？(2 grades)
A)FIFO B)LRU C)PFF D)OPT
(87)What binary number is encoded with Differential Manchester in the
diagram below？(2 grades)
│┌─┐┌┐┌┐┌─┐┌┐┌┐┌┐┌─┐│
││││││││││││││││││
││││││││││││││││││
└┘└┘└┘└─┘└┘└┘└┘└─┘└┘
A)10110011100 B)11001100011
C)11000110010 D)00111001101
(88)Each host or router on the Internet has its own IP address.There
are four IP addresses as followings.Which IP address is erronedus？
A)189.132.2.1 B)255.255.255.0
C)198.73.265.50 D)192.0.0.3
(89)When should Frequency Division Multiplexing be used？
A)when the attenuation on a medium is greater than 25％。
B)when the white noise on the medium exceeds 50％of the medium's
bandwidt  h
C)when the achievable data rate of the medium exceeds the data
rate of the digital signals to be transmitted
D)when the useful bandwidth of the medium exceeds the required
bandwidth of the digital signals to be transmited
(90)The universe of hypertext servers that allow text,graphics,sound,
and other multimedia files to be viewed togather and navigated via
hypertext links.It is now the fastest growing area of the Internet.It
is
A)Gopher B)WWW C)E——mail D)FTP