1999四级英语部分试题与答案Word格式.docx
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1999四级英语部分试题与答案Word格式.docx
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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
答案:
56-60BDCAA61-65ADCAC66-70ABACB
2003年试题
(56)Whatisthedecimalvalueofthebinaryvalue10010?
A)16B)17C)18D)19
(57)Inacomputer,whichofthefollowingisthelongestperiod?
A)BeatperiodB)MachineperiodC)InstructionperiodD)CPUperiod
(58)WhichofthefollowingisnotanAVLtree?
(59)Traversingabinarytreeinpreorderisequivalentto
A)Traversingtheforestcorrespondingtothebinarytreeinroot-firstorder.
B)Traversingtheforestcorrespondingtothebinarytreeinroot-lastorder.
C)Traversingtheforestcorrespondingtothebinarytreeinbreadth-firstorder.
D)Noneoftheabove.
(60)WhichofthefollowingmethodsisusedtoincreasethenumberofprocessessharingtheCPU?
A)InterruptB)Scheduler
C)SwappingD)WorkingSet
(61)Whichofthefollowingstatementsdescribe(s)thepropertiesofapurelysegmentedmemorysystem?
Ⅰ.Itdividesmemoryintounitsofequalsize
Ⅱ.Itpermitsimplementationofvirtualmemory
Ⅲ.Itsuffersfrominternalfragmentation
A)ⅠonlyB)Ⅱonly
C)ⅢonlyD)ⅠandⅢ
(62)Asanimportantphaseinsoftwaredevelopment,softwaredesignisthecontinuationofsoftwarerequirementanalysisphase.
Ⅰ.softwarestructureⅡ.softwareprocedure
Ⅲ.softwaremoduleⅣ.softwaredocument
whichofthefollowingshouldbeincludedinsoftwaredesignphase?
A)ⅠandⅡB)ⅡandⅢ
C)Ⅰ,ⅡandⅢD)All
(63)Whiteboxtestingofsoftwaretestingisatestforsoftwarestructure.Whichofthefollowingitemshouldnotbeincludedinthecontentofwhitebox?
A)boundaryvalueanalysisB)statementtesting
C)branchtestingD)pathtesting
(64)ConsiderarelationR(A,B,C,D)withthefollowingdependencies:
AB?
C,CD?
E,DE?
B.
Acandidatekeyofthisrelationis
A)ABB)ABCC)ABDD)ABE
(65)LetRandSbethefollowingrelations:
A)3B)4C)5D)6
(66)ThePentiumincludeshardwareforbothsegmentationandpaging.Bothmechanismscanbedisabled,allowingtheusertochoosefromfourdistinctviewsofmemory.Nowthemostfrequentlyusedview(suchasUnixSystemV)is
A)UnsegmentedunpagedmemoryB)Unsegmentedpagedmemory
C)SegmentedunpagedmemoryD)Segmentedpagedmemory
(67)ASCIIisa7-bitcodeusedtorepresentnumeric,alphabetic,andspecialprintablecharacters.Italsoincludescodesforcontrolcharacters,whichare
A)printableordisplayableB)notprintableordisplayable
C)notprintablebutdisplayableD)printablebutnotdisplayable
(68)Inmostwideareanetworks,thecommunicationsubnetconsistsoftwodistinctcomponents:
transmissionlinesand
A)networtsB)switchingelements
C)computersD)dataterminalequipment
(69)Toaccommodatethelongestpathallowedby802.3,theslottimehasbeensetto512bittimes,or
A)0.512μsB)5.12μs
C)51.2μsD)512μs
(70)TCP(TransmissionControlProtocol)wasspecificallydesignedtoprovideareliableend-to-endbytestreamovera(n)
A)IPaddressB)reliablenetwork
C)socketD)unreliableinternetwork
(56)C(57)C(58)B(59)A(60)C
(61)B(62)D(63)A(64)C(65)B
(66)D(67)B(68)B(69)C(70)D
2002年试题
(56)Inacomputer,ifalogicalleftshiftoftheoperandoccurs,itslowestbitis
A)1B)unchangedC)0D)random
(57)TheCPUiscomposedoftwocomponents,whichare
arithmeticlogicunitandcontroller
memoryandcontroller
arithmeticlogicunitandmemory
controllerandstorage
Items58and59arebasedonethefollowinghashtable.
Hashfunctionis:
h(key)=keymod13
Collisionsaresolvedbyusingopenaddressing,linearprobing.
(58)Loadfactorαofthehashtableisapproximately
A)0.28B)0.35C)0.54D)0.71
(59)Howmanykeycomparisonsareneededinsearchingforkeyvalue38?
A)1 B)2 C)3D)4
(60)Whichofthefollowingoperationsbelongstomessagepassing?
A)readandwriteB)saveandreceive
C)waitandsignalD)PandV
(61)IffileAhasthecapabilityof724,thesamegroup’susersoffileAmaydo
A)readAonlyB)writeAC)executeAD)non-operation
(62)InwhichphaseofthesoftwareengineeringprocessistheSoftwareRequirementsSpecificationdeveloped?
A)definitionphaseB)engineering
C)maintenanceD)developmentphase
(63)Theprototypingmethodisadynamicdesignprocess,whichrequirespeoplewhouseprototypingmethodtohavethefollowingcapabilityof
A)proficientprogramexpertiseB)immediatelyacquirerequirement
C)coordinate&
organizeeloquentlyD)handletoolssmartly
(64)ForrelationRwhereprimarykeycontainsmultipleattributes,nonon-keyattributeshouldbefunctionallydependentonapartoftheprimarykey.ThisrelationRisatleastin
A)1NF B)2NF C)3NF D)BCNF
(65)Whichofthefollowingstatementsaboutobjectorienteddatabseisnotcorrect?
A)Eachobjecthasauniqueobjectidentityinthesystem.
B)Encapsulationandinheritancearetwoimportantfeaturesofobjectorienteddatabase.
C)Asubclasscaninherittheattributesandmethodsofallitssuperclasses.
D)Asubclassincludestheattributesandmethodsofallitssubclasses.
(66)Localbuscanincreasethedatathroughput.Thebusthatismostfrequentlyusedis
A)VESAB)EISA C)MCAD)PCI
(67)Mostfrequentlyusedalgorithmforpagereplacementis
A)LRUB)FIFOC)OPTD)PPT
(68)ThefollowingthreeconceptsareessentialtotheOSImodel:
service,interfaceand
A)networksB)applications
C)protocolsD)layers
(69)LANscanbeconnectedbyusingbridges,whichoperateinthe
A)physicallayerB)datalinklayer
C)networklayerD)transportlayer
(70)TCPserviceisobtainedbyhavingboththesenderandthereceivercreateendpoints,whicharecalled
A)networkaddressB)supernetaddress
C)socketD)IPaddress
(56)C(57)A(58)C(59)C(60)B
(61)B(62)A(63)B(64)B(65)D
(66)D(67)A(68)C(69)B(70)C
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2001年试题
56.Aninstructionthatusesindrectaddressingmusttcontainanaddressofmemorywhere
A)dataisstoredB)apipelinestallwillbeexecuted
C)apagefaultisaddressed
D)anotheraddressisstored
57Theprincipleforastackmemorytostoredatais
A)FIFOB)FILOC)randomD)otherway
58Intheforestcorrespondingtothefollowingbinarytree,howmanychildrendoesnodeBhave?
A)1B)2C)3D)4
59FortherootofB_treeoforderm,theminimalnumberofitschildrenis
A)2B)ë
m/2û
C)é
m/2ù
D)m
60Adiskschedulingmechanisminanoperatingsystemcausesthediskarmtosweepbackandforthacrossthedisksurfaceservicingallrequestsinitspath.Thisisa
A)FirstComeFirstServeB)ShortestSeekTimeFirst
C)ScanD)Noneoftheabove
61Theconstruct
cobegin
Statement1;
Statement2;
coend
meansStatement1andStatement2aretobeexecutedinparallel.Theonlytwoatomicactionsinthisconstructareloadingthevalueofavariableandstoringintoavariable.Fortheprogramsegment
x:
=0;
y:
=O;
begin
=l;
=y+x;
end;
=2;
=x+3;
end
Whichofthefollowingindicate(s)possiblevaluesforthevariableswhenthesegmentfinishesexecution?
Ⅰ.x=1,y=2
Ⅱ.x=1,y=3
Ⅲ.x=4,y=6
A)Ⅰ
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