歷年計算機等級考試四級三-計算機等級真題-計算機等-資料下載頁
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【正文】 thefollowingstatementsiscorrect?(2Points) A)ThedefinitionphaseresultsintheSoftwareRequirementsSpecification. B)Testingisoptionalinsoftwarelifecycle. C)CASEtoolscanonlyaidinthedesignphaseofasoftwarelifecycle. D)Achangeduringalaterphasedoesnotrequirethedocumentationofall earlierphasestobeupdated. (82)Blackboxandwhiteboxtestingmethodareoftenusedinsoftwaretestingphase， inwhich，thewhiteboxismainlyusedtotestsoftware’s A)reasonablenessofstructure B)correctnessofaprogram C)externalfunctionofaprogram D)internallogicofaprogram (83)HowdoesBooth’sAlgorithmimprovebinarymultiplication? A)Itpreventsoverflow. B)Itpreventsunderflow. C)Itpreservesthesignofthemultiplicationoperation. D)Itenhancesthespeedoftheoperationsignificantly. (84)Acachehas64blocks。eachblockis16blockdoesbyte1200mapto? A)25 B)60 C)75 D)100 (85)WhichisNOTacharacteristicofanRISCprocessor? A)ahighclockspeed B)ahighlyoptimizedpipeline C)afewgeneralpurposeregisters D)alimitedamountofsmallinstructions (86)Youareperformingtwosums:thefirstisasumoftwoscalarvariablesandthe secondisamatrixsumofapairoftwodimensionalarrayssize1000by1000.What speedupisachievedwhenthecalculationsareperformedonsize1000processors? (2Points) A)50 B)100 C)999 D)noneoftheabove (87)AccordingtoShannon’sequation，whatisthechannelcapacityofananalog voicegradephonelinewithabandwidthof3100Hzandasignaltonoiseratio or30dB?(2Points) A)Kbps B)Kbps C)Kbps D)Kbps (88)Thestandardspecifiesthreelayersoffunctionality.Whichlayersofthe OSImodelcorrespondtothelayers? A)thePhysical，Network，andSessionLayers B)thePhysical，DataLink，andNetworkLayers C)thePhysical，DataLink，andTransportLayers D)thePhysical，Session，andPresentationlayers (89)Whichroutingalgorithmisdescribedbelow? Itisamechanisminwhichthesetdingstationdeterminestheroutetheframe willfollowandincludestheroutinginformationwiththeframe。bridgesread theroutinginformationtodetermineiftheyshouldforwardtheframe. A)FixedRouting B)SpanningTree C)SourceRouting D)FrameForwarding (90)WhichOSIlayerdoesabridgeoperateat? A)thePhysicalLayer B)theNetworkLayer C)theTransportLayer D)theDataLinkLayer 二、論述題（兩個論述題可任選其一，并只選其一，多選無效，滿分30分） 論述題1 在計算機指令集的設(shè)計與實現(xiàn)過程中，出現(xiàn)了兩種對立的技術(shù)路線或風(fēng)格，即CISC與RISC. (1)指出CISC的主要弊病。(8分) (2)概述RISC技術(shù)的基本要點.(12分) (3)IntelX86系列屬于哪一種風(fēng)格，當(dāng)前它采用的是怎樣的技術(shù)路線.(10分) 論述題2 人們在管理實踐中發(fā)現(xiàn)，數(shù)據(jù)庫技術(shù)是信息資源的整理、保存、管理和使用的最有效的手段。數(shù) 據(jù)庫按其數(shù)據(jù)結(jié)構(gòu)模型分類，通?？煞譃閷哟涡蛿?shù)據(jù)庫、網(wǎng)絡(luò)型數(shù)據(jù)庫、關(guān)系型數(shù)據(jù)庫和面向?qū)ο笮蛿?shù) 據(jù)庫，各種類型的數(shù)據(jù)模型都有自身的特點。試從關(guān)系數(shù)據(jù)模型的優(yōu)點和弱點論述： (1)為什么人們在開發(fā)以事務(wù)處理為主的信息系統(tǒng)（例如管理信息系統(tǒng)）時，大多選用關(guān)系型數(shù)據(jù)庫 作為開發(fā)環(huán)境？（18分） (2)在許多含有復(fù)雜數(shù)據(jù)結(jié)構(gòu)或豐富語義的實際應(yīng)用領(lǐng)域中，為什么要選用面向?qū)ο髷?shù)據(jù)庫或要對關(guān) 系型數(shù)據(jù)庫作某些擴充和修改？（12分）
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