捷成计算机等级考试四级模拟试题.doc

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1、捷成计算机等级考试四级模拟试题（第四套）1)P(n)isthepredicate'if4dividenthen2dividesn'.A)10B)FC)TD)Noneoftheabove2)WhatisthedefinitionofaPathA)Asequenceandtheedgesformedbyeachsuccessivepairofvertices.B)Awalkwithdistinctvertices.C)Awalkwithdistinctedges.D)Noneoftheabove.3)Whic

2、hUNIXcommandcreatesasymboliclinknamedmyfileinthecurrentdirectorytothefile/etc/hostsA)ln-s/etc/hostsmyfileB)ln-smyfile/etc/hostsC)link-s/etc/hostsmyfileD)link-smyfile/etc/hosts4)WhichMS-DOScommandiscorrectA)DEL/S*.batB)DEL*.exe/SPC)DEL*.obj>NUL:D)DEL*.com*

3、.sys5)Avirtualmemorysystemhasfivevirtualpagesnumberedzerothroughfourandthreepageframes.Allthepageframesareinitiallyempty.HowmanypagefaultsaregeneratedwiththefollowingaccesssequenceusingaFIFOreplacementpolicy012301401234A)8B)9C)10D)116)WhichelementisNOTpar

4、tofamicrokernel?A)basicI/OB)afilesystemC)IPCmechanismsD)memorymanagement7)Whichislocaltoathreadinsteadofaprocess?A)astackB)anopenfileC)asemaphoresD)anaddressspace8)Whatisasubselectstatement?A)aselectstatementthatselectsasubsetoffieldsinatableB)aselectstat

5、ementthatreturnsasubsetofthedatainatableC)aselectstatementthatappearswithinanotherselectstatementD)aselectstatementthatreturnsasubsetoftheconstraintsonafield9)Indevelopingahospitaldatabase,itisdeterminedthatontheaverage,eachpatientwillhave6treatmentsdurin

6、gahospitalstay.Theaveragelengthofastayisthreedays.Thehospitalhas1000beds.Thereareonthe800patientsoccupyingbedseachday.TherelationshipbetweenPATIENTandTREATMENTis1:M.TherelationshipbetweenPATIENTandBEDis1:1,conditional.Iftreatmentrecordoccurrencesarearchiv

7、edassoonasapatientisdischardedfromthehospital,howmanyoccurrencesoftheTREATMENTrecordswillbestoredintheTREATMENTdatabasefileontheaverage?A)6,000B)4,800C)18,000D)1,60010)Whichofthefollowingconditionswillmakearelationthatisinfirstnormalfromtobeinsecondnormal

8、form?Ⅰ.everynon-keyattributeisfunctionallydependentonthefullsetofprimarykeyattributes.Ⅱ.nonon-keyattributesexistintherelation.Ⅲ.theprimarykeyconsistsofonlyoneattribute.A)ⅠonlyB)ⅠandⅡonlyC)ⅠandⅢonlyD)anyofthem11)Them