2004年9月全国计算机等级考试四级笔试试卷
(49)计算机网络按照其覆盖的地理区域大小可分为
A)广域网、校园网、接入网B)广域网、城域网、局域网
C)校园网、地区网、接入网D)电信网、校园网、城域网
(50)在OSI参考模型中，下列哪层提供了源主机和目的主机之间可靠的端-端通信
A)网络层B)应用层C)会话层D)传输层
(51)总线拓扑常用基带传输和宽带传输技术，其中基带传输是一种
A)单向传输技术，采用数字信号发送
B)双向传输技术，采用数字信号发送
C)双向传输技术，采用模拟信号发送
D)单向传输技术，采用模拟信号发送
(52)常用的数据交换技术是
A)电路交换、报文交换、分组交换
B)电路交换、虚电路、分组交换
C)电路交换、报文交换、数据报
D)分组交换、报文交换、虚电路
(53)发送时将数字数据转换成模拟信号、接收时将模拟信号还原为数字数据的设备是
A)调制解调器B)编码解码器C)网络接口卡D)终端收发器
(54)Ethernet采用的介质访问控制技术是
A)CSMA/CDB)TokenBusC)TokenRingD)CSMA/CA
(55)IP协议不能解决的问题是
A)路由选择B)数据单元的分段与重组
C)网络管理D)寻址
(56)TheALUperformsarithmeticoperationsand
A)reducedinstructioncalculations
B)logicaloperations
C)paritychecks
D)binarycalculations
(57)CPUperformanceismeasuredbythefollowingstandardsexcept
A)clockrateB)wordsizeC)CacheD)RAM
(58)Whichofthefollowingoperationsusesthequeue？
A)Traversingabinarytreeinpreorder
B)Traversingabinarytreeininorder
C)Searchingthegraphinbreadth-firstorder
D)Thetopologicalsortingforaderectedgraph
(59)Whichofthefollowingsortingmethodsisnotaninternalsort？
A)TopologicalsortB)Insertionsort
C)QuicksortD)Mergingsort
(60)ThefourbasicmanagementfunctionsofOSareprocessmanagement，storagemanagement，I/Osystemmanagement，and
A)filemanagementB)segmentationmanagement
C)file-protectingD)swappingmanagement
(61)Whichkindofoperatingsystemshaswell-defined，fixedtimeconstraints？
A)real-timeB)time-sharing
C)batchsystemD)networksystem
(62)Whichtaskbelowisnotconcernedinsoftwaredesign？
A)StructuredesignB)Interfacedesign
C)DetaileddesignD)Programming
(63)Whichofthefollowingisnotasoftwarelifecyclemodel？
A)IncrementalmodelB)Prototypemodel
C)ProcessmodelD)Linearmodel
(64)ForrelationSC(S#，C#，GRADE)，whichofthefollowingisnotarightoperation？
A)SELECTS#FROMSCWHEREC#=’C002’ANDC#=’C012’；
B)SELECTC#GRADEFROMSCWHERES#=’S005’ORS#=’S008’；
C)SELECTS#FROMSCWHEREGRADEISNULL：
D)UPDETESCSETGRADE=GRADE+5；
(65)Considerrelationr？，s1(S)，s2(S)，letR？S，s1？s2，q=r÷s1，q=r÷s2，Whichofthefollowingistrue？
A)q？q'B)q？q'C)q？q'D)q？q'
(66)WhichofthefollowingisnotatypicalcharacteristicofReducedInstructionSetComputer
A)Oneinstructionmulti-cycleB)Register-toRegisteroperation
C)SimpleaddressmodeD)LOAD/STOREstructure
(67)ComputerArchitectureistheattributesofacomputingsystemasseenbyaprogrammer，i。e。，theconceptualstructureandfunctionalbehavior。Forexample，
A)MicroprogramB)Addressmode
C)MemoryspeedD)Hardwarelogicdesign
(68)EthernetusesManchesterencoding，whichisa
A)physical-layeroperationB)link-layeroperation
C)network-layeroperationD)LLC-layeroperation
(69)Thedevicethattakesaninputandsimplybroadcastsitonalltheotherinterfacesisknownas
A)abridgeB)arouterC)ahubD)agateway
(70)FTPis
A)atransport-layerprotocolB)anapplicationprotocol
C)anetwork-layerprotocolD)asession-layerprotocol
二、论述题（四个论述题可任选其一，并只选其一，多选无效，满分30分)
论述题答题必须用蓝、黑色钢笔或圆珠笔写在论述题答题纸的相应位置上，否则无效。
论述题1
在多道程序系统中，一组进程中的每一个进程均无限期的等待被该组进程中的另一进程所占有、且永远不会释放的资源，这种现象将导致系统处于死锁状态。试述：
