歷年計算機等級考試四級三-計算機等級真題-計算機等(參考版)
2025-08-07 14:47本頁面
【正文】 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）。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，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。X86技術(shù)的基本要點.(12分) (3)概述的主要弊病。指出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CISCLinkthe TransportLayer C)the Physicalat? A)bridgedoesOSIForwarding (90)D)RoutingTree C)B)Routingframe. A)forwardtheydetermineinformationread thetheinformationtheandframe willroutedeterminessetdingwhichmechanismisdescribedalgorithmlayers (89)WhichPhysical，Session，andLayers D)Link，andtheNetworkPhysical，DataLayers B)Physical，Network，andlayers? A)thecorrespond OSIofWhichofthreestandardKbps (88)TheD)KbpsC)Kbps B)(2ratio oraHzofaline voicegradeancapacitythewhatShannon’sabove (87)AccordingofD)999 B)50 (21000onaretheachievedWhat speedupbyarrayssizetwopairofmatrixisandscalarofafirstsums:performinginstructions (86)Youoflimitedregisters D)fewpipeline C)highly B)clockaRISCofaisD)100 (85)75 B) ? A)mapbyteblock16block64cachesignificantly. (84)thespeedenhancesoperation. D)thesignpreservesunderflow. C)It preventsmultiplication? A)improveBooth’sHowalogicD)programofexternalacorrectness ofsoftware’s A)tomainlywhiteboxphase， insoftwareusedaretestingandbephasesofthenotphaseachangecycle. D)softwareofdesigninonlytoolscycle. C)softwareoptionalTestingRequirementstheresultsdefinitionPoints) A)correct?statementstheWhichdevelopmentD)phasethetestingB)phasethemost developmentrequiressoftwareofWhichD)ExpansibilityMaintanence Points) A)software’salsodevelopmentbasisandofimportantisSoftwarelargeroftheusedItthecostestimatingassistsrequirements C)gatheringassistssystem. B)theplacetakesprototype? A)buildingservedisWhich C)B)databasefollowingofisconcurrencyinlocking monlythem (77)Theany?、驝)onlyⅠand Ⅰoneofkeyrelation. Ⅲ．theinattributeskey attributes. Ⅱ．nooffullonfunctionallyattributeform? Ⅰ．everysecondbenormalinthatawillfollowingof C)4，800 Points) A)the average?fileTREATMENTinberecordsthemanythedischardedpatientasasarerecordIf1，isandbetweenThel:TREATMENTPATIENTrelationshipeach occupying800thearebeds.has isalengthThehospitalduring6willthethatishospitaldevelopingaconstraintsofathatselectstatement D)anotherappearsstatementaadataofathatselecttable B)inofathatselectstatement? A)aWhataddressD)semaphoresC)filean a(2ainsteadalocalWhichmemory IPCsystema basic(2apartisWhichD)10 B)8420131 (2replacementasequencefollowingwitharepageHowinitiallyframestheframes.andthroughnumberedvirtualhasmemoryA*. D)*.obj*.exe/sp C) B)*.batDELisMSDOS/etc/hosts (70)sD)myfiles/etc/hosts C)sB)myfilesfile/etc/hosts? A)directorythemyfilelinkamandWhichrequireSelectionSortBothsortwithlargeperformancegive theSortsorted，antothatanarerandomexpensive C)thesortsort. B)atofrequentlysortPoints) A)techniques?simpletruestatementstheWhichineventplace，ofthejthofthewilltoAeachdifferenttoonplacestoincanThearra
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