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目前，除了传统的串口和并口外，计算机与外部设备连接的标准接口越来越多。例如， (1) 是一种连接大容量存储设备的并行接口，数据宽度一般已为32位，且允许设备以雏菊链形式接入； (2) 是一种可热插拔的...
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中级数据库系统工程师《相同项单选集》真题及答案
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目前除了传统的串口和并口外计算机与外部设备连接的标准接口越来越多例如90是一种连接大容量存储设
VESA
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SCSI
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IEEE1394接口是一种接口标准这种接口允许把微机微机外部设备及各种电设备连接在一起这种标准接口是
并行
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目前除了传统的串口和并口外计算机与外部设备连接的标准接口越来越多例如90是一种连接大容量存储设
PCMCIA
VESA
EISA
PCI
目前流行的台式PC机不宜通过机箱提供的标准接口或总线连接器是
PCI总线连接器
IEEE 1284标准并口连接器
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RS 232标准串口连接器
计算机网络是指________.
用网线将多台计算机连接
配有计算机网络软件的计算机
用通信线路将多台计算机及外部设备连接，并配以相应的网络软件所构成的系统
配有网络软件的多台计算机和外部设备
个人计算机PC是除了主机外还包括外部设备的微型计算机而其必备的外部设备是______
键盘和鼠标
显示器和键盘
键盘和打印机
显示器和扫描仪
IEEE1394接口是一种接口标准这种接口允许把计算机计算机外部设备各种家电设备非常简单地连接在一起
并行
串行
并串行
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计算机与外部设备的常用接口标准有哪些
目前除了传统的串口和并口外计算机与外部设备连接的标准接口越来越多例如1是一种连接大容量存储设备的并行
PCMCIA
USB
SCSI
EISA
目前除了传统的串口和并口外计算机与外部设备连接的标准接口越来越多例如1是一种连接大容量存储设备的并行
PCMCIA
USB
SCSI
EISA
目前除了传统的串口和并口外计算机与外部设备连接的标准接口越来越多例如1是一种连接大容量存储设备的并行
VESA
USB
SCSI
PCI
目前除了传统的串口和并口外计算机与外部设备连接的标准接口越来越多例如1是一种连接大容量存储设备的并行
PCMCIA
VESA
EISA
PCI
目前除了传统的串口和并口外计算机与外部设备连接的标准接口越来越多例如1是一种连接大容量存储设备的并行
PCMCIA
VESA
EISA
PCI
目前除了传统的串口和并口外计算机与外部设备连接的标准接口越来越多例如90是一种连接大容量存储设
PCMCIA
USB
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EISA
用户使用ADSL接入互联网时需要通过一个ADSLModem连接计算机该设备一般连接到计算机的
打印端口
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目前除了传统的串口和并口外计算机与外部设备连接的标准接口越来越多例如46是一种连接大容量存储设备的并
PCMCIA
VESA
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目前除了传统的串口和并口外计算机与外部设备连接的标准接口越来越多例如46是一种连接大容量存储设备的并
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以下关于热插拔的描述不正确的
可以在不切断电源的情况下进行更换硬盘、拔出连接在主机的外部设备等
计算机的USB接口设备支持热插拔技术
计算机的IEEE1394接口(中文译为火线接口)设备支持热插拔技术
计算机的PS/2接口设备支持热插拔技术
目前除了传统的串口和并口外计算机与外部设备连接的标准接口越来越多例如46是一种连接大容量存储设备的并
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WebSQLisaSQL-like26languageforextractinginformationfromtheweb.Itscapabilitiesforperformingnavigationofweb27makeitausefultoolforautomatingseveralweb-relatedtasksthatrequirethesystematicprocessingofeitherailthelinksina28allthepagesthatcanbereachedfromagivenURLthrough29thatmatcha’patternoracombinationofboth.WebSQLalsoprovidestransparentaccesstoindexserversthatcanbequeriedviatheCommon30Interface. 26是
Mostcomputersystemsare165totwodifferentgroupsofattacks:Insiderattacksandoutsiderattacks.Asystemthatisknowntobe166toanoutsiderattackbypreventing167fromoutsidecanstillbevulnerabletotheinsiderattacksaccomplishedbyabusiveusageof168users.Detectingsuchabusiveusageaswellasattacksbyoutsidesnotonlyprovidesinformationondamageassessmentbutalsohelpstopreventfutureattacks.Theseattacksareusually169bytoolsreferredtoasIntrusionDetectionSystems. 169处是
Manywordprocessingprogramsincludespellchecker.Itchecksthespellingofeverywordina120bylookingupeachwordinitsdictionary.Iftheworddoesnotappearinthedictionarytheuseris121topossiblemisspellingandpossiblecorrectionsareoften122.Spellcheckerdoesnotrecognizeunusualpeoplenamesorspecializedtermsbutitwilloftenallowyoutocreateyourownpersonaldictionaryofspecializedwordsyouoftenuse.Spellcheckerisavaluableaidtoproofreadingbutitcannotcatchthe123ofonecorrectlyspelledwordforanothersuchasformforfrom.Thusitdoesnot124adocumentisfreeofspellingerrors. 121处是
从供选择的答案中选出应填入下列叙述中内的正确答案SQL是一种A语言集B功能于一体SQL查询语句的一种典型句型是SELECTX1X2．．XnFROMA1A2．．．AmWHEREF其中Xii=12nAjj=12mF分别是C设关系模式SCGS#C#grade中S#为学生学号C#课程号grade为某学号学生学某门课程的考试成绩今要查询每门课程的平均成绩且要求查询的结果按平均成绩升序排列平均成绩相同时按课程名降序排列则用SQL查询语言应为D若查询的结果仅限于平均分数超过80分的则应E供选择的答案A①高级算法②人工智能③关系数据库④函数型B①数据定义数据操作数据安全②数据完整性数据安全数据并发控制③数据定义数据操作数据控制④数据查询数据更新数据输入输出C://①基本表名目标表名逻辑表达式②基本表名目标表名数值表达式③目标表名基本表名逻辑表达式④目标表名基本表名数值表达式D://①SELECTC#AVGgrade②SELECTC#AVGgradeFROMSCGFROMSCGGROUPBYgradeGROUPBYC#ORDERBY2C#DescORDERBY2C#Desc③SELECTC#AVGgrade④SELECTC#AVGgradeFROMSCGFROMSCGWHEREC#DescGROUPBYAVGgradeGROUPBYgradeORDERBY2C#DescE://①在GROUP子句的下一行加入HAVINGAVGgrade＞80②在GROUP子句的下一行加入HAVINGAVGgrade＞80③在GROUP子句的下一行加入WHEREAVG*＞80④在GROUP子句的下一行加入WHEREAVG*＞80
从供选择的答案中选出应填入下列叙述中内的正确答案多媒体技术中图形格式一般为两类即A和B具体的存储方式有许多种通常用图形文件的后缀名来区分如以C为后缀名的则是以ASCII方式存储的图形而D则不是图形文件的后缀名多媒体中的视频信息是指E供选择的答案A①灰度②位图③函数④高分辨率B①彩色②场③矢量④低分辨率C://①DIF②MPG③JPG④BMPD://①DIB②WMF③T1F④WAVE://①屏幕图像刷新频率②图像扫描输入频率③动态图像④静止图片
内模式是系统程序员用一定的形式组织起来的一个个存储文件和联系的手段A记录B数据C视图D文件
从供选择的答案中选出应填入下列叙述中内的正确答案数据库系统是由ABC和软件支持系统组成其中A是物质基础软件支持系统中D是不可缺少的B体现数据之间的联系C简称DBA常见的数据模型有多种目前使用较多的数据模型为E模型供选择的答案A～D://①计算机硬件②C语言③CPU④数据库管理系统⑤数据库⑥主菜单⑦人⑧网络管理系统E://①层次②网状③关系④拓朴
Manywordprocessingprogramsincludespellchecker.Itchecksthespellingofeverywordina120bylookingupeachwordinitsdictionary.Iftheworddoesnotappearinthedictionarytheuseris121topossiblemisspellingandpossiblecorrectionsareoften122.Spellcheckerdoesnotrecognizeunusualpeoplenamesorspecializedtermsbutitwilloftenallowyoutocreateyourownpersonaldictionaryofspecializedwordsyouoftenuse.Spellcheckerisavaluableaidtoproofreadingbutitcannotcatchthe123ofonecorrectlyspelledwordforanothersuchasformforfrom.Thusitdoesnot124adocumentisfreeofspellingerrors. 123处是
实现实体问MN联系比较复杂A关系模型B面向对象模型C网状模型D层次模型
关于信息和数据下面正确的说法是A信息与数据只有区别没有联系B信息是数据的载体C同一信息用同一数据表示形式D数据处理本质上就是信息处理
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设有关系模型RABCDEF其函数依赖集为F=E→DC→BCE→FB→A则R最高属于A1NFB2NFC3NFD4NF
Mobilecomputers-which71laptopsnotebookssubnotebooksandhandhelds-72soubiquitousinsuchashorttimenosurprisetohearwhosay:"Itwilldefinetheleadingedge73thenextfiveyearsorso."Themostremarkable74mobilecomputersistheamountofdatastorageandmemorypacked75theirtinyboxes.Thesedevicesnotonlyhandlewindowseasilybutalsorunstorage-hungryprograms. 75处是
Whenmostpeoplerefertomultimediatheygenerallymeanthecombinationoftwoormorecontinuousmediausuallywithsomeuser115.Inpracticethetwomediaarenormallyaudioandvideothisis116plusmoving117. Itshouldbe’obviousbynowthattransmittingmultimediamaterialinuncompressedformiscompletelyoutof118.Theonlyhopeisthatmassivecompressionispossible.Fortunatelyalargebodyofresearchoverthepastfewdecadeshasledtomanycompressiontechniquesandalgorithmsthatmakemultimediatransmission119. 118是
Inrecentyearsoneofthemorepopulartopicsforpaneldiscussionsatcomputerconferencesandtrade61hasbeenthe"RISCversusCISC"debate. RISCprocessorsfeatureasmallnumberofinstructionsthateachexecutesin62machinecycle.CISCprocessorsusecomplexinstructionsthatcantakeseveralcyclestoexecute. TheRISCversusCISCdebatewon’tbedecidedbypaneldiscussion;itwillbewoninthemarketplace.Andthedecidingfactormayhavelittletodowith63ofinstructionsandregistersandmoretodowithparallelism. SincetheirconceptionRISCprocessorshavebeenevolvingtowardmicroparallelismincorporatingparallel-processingfeatures64theprocessorRISCprocessorsfeaturepipeliningwherebymanyinstructionscanbedecodedwhileoneinstructionexecutes.RISCprocessorshoweveraremovingtowardpipelinesforeachunitoftheprocessor. CISCprocessorsalsoemploypipelining.TheyhavemanyintegerinstructionsthatexecuteinonecyclebutthevaryingexecutiontimesofCISCinstructions65theeffectivenessofparallelism. 62处是
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Programmingisa46thathasvariousengineeringand47aspects.Althoughmostoftheseaspectsareinterrelatedeachofthemcoversanumberof48andgoalswinchareveryspecific.Theprogressbeingmadeinteaching49isreflectedbythefactthatmost50sciencecurriculacontainabroadspectrumofprogrammingcourseseachemphasizingadifferentaspectofprogramming. 49处是
从供选择的答案中选出应填入下列叙述中内的正确答案DBMS是位于A之间的一层数据管理软件关系数据库的概念模型式是B的集合关系数据库的数据及更新操作必须遵循C等完整性规则用符号.|X|表示的关系操作称为D操作没有关系R和S如下供选择的答案A①OA软件与用户②OS与DB③硬件与软件④OS与硬件B①关系模型②关系模式③关系子模式④存储模式C://①实体完整性和参照完整性②参照完整性和用户定义的完整性③实体完整性和用户定义的完整性④实体完整性参照完整性和用户定义的完整性D://①左外连接②右外连接③自然连接④外连接E://①左外连接②自然连接③外连接④右外连接
Whenmostpeoplerefertomultimediatheygenerallymeanthecombinationoftwoormorecontinuousmediausuallywithsomeuser115.Inpracticethetwomediaarenormallyaudioandvideothisis116plusmoving117. Itshouldbe’obviousbynowthattransmittingmultimediamaterialinuncompressedformiscompletelyoutof118.Theonlyhopeisthatmassivecompressionispossible.Fortunatelyalargebodyofresearchoverthepastfewdecadeshasledtomanycompressiontechniquesandalgorithmsthatmakemultimediatransmission119. 116是
Forusersmicrokerneltechnologypromises90compactandsophisticatedoperatingsystemsthataretypically91acrossarangeofhardwareplatforms.Theseoperatingsystemswillbecustomizabletoletusersrunmultipleoperatingsystemandapplication"personalities"ontopofasinglemicrokernel92. Microkernelbasedsystemscanprovidethisflexibilitybecausethecoreoperatingsystemfunctionsare93fromthelargenumberofutilitiesfeaturesandextensionsthatarelayeredontopofthem.Asaresultupdatingandmaintainingoperatingsystemiseasiersincedevelopersdon’thavetomodifythe94everytimetheymustacidanewfeature. 92是
Mostcomputersystemsare165totwodifferentgroupsofattacks:Insiderattacksandoutsiderattacks.Asystemthatisknowntobe166toanoutsiderattackbypreventing167fromoutsidecanstillbevulnerabletotheinsiderattacksaccomplishedbyabusiveusageof168users.Detectingsuchabusiveusageaswellasattacksbyoutsidesnotonlyprovidesinformationondamageassessmentbutalsohelpstopreventfutureattacks.Theseattacksareusually169bytoolsreferredtoasIntrusionDetectionSystems. 165处是
Programmingisa46thathasvariousengineeringand47aspects.Althoughmostoftheseaspectsareinterrelatedeachofthemcoversanumberof48andgoalswinchareveryspecific.Theprogressbeingmadeinteaching49isreflectedbythefactthatmost50sciencecurriculacontainabroadspectrumofprogrammingcourseseachemphasizingadifferentaspectofprogramming. 47处是
下面是并发控制的主要方法A授权B封锁C口志D索引
Mobilecomputers-which71laptopsnotebookssubnotebooksandhandhelds-72soubiquitousinsuchashorttimenosurprisetohearwhosay:"Itwilldefinetheleadingedge73thenextfiveyearsorso."Themostremarkable74mobilecomputersistheamountofdatastorageandmemorypacked75theirtinyboxes.Thesedevicesnotonlyhandlewindowseasilybutalsorunstorage-hungryprograms. 71处是
一个好的模式设计应符合下列原则A表达式B分离性C最小冗余性D以上3条
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Forusersmicrokerneltechnologypromises90compactandsophisticatedoperatingsystemsthataretypically91acrossarangeofhardwareplatforms.Theseoperatingsystemswillbecustomizabletoletusersrunmultipleoperatingsystemandapplication"personalities"ontopofasinglemicrokernel92. Microkernelbasedsystemscanprovidethisflexibilitybecausethecoreoperatingsystemfunctionsare93fromthelargenumberofutilitiesfeaturesandextensionsthatarelayeredontopofthem.Asaresultupdatingandmaintainingoperatingsystemiseasiersincedevelopersdon’thavetomodifythe94everytimetheymustacidanewfeature. 94是
WebSQLisaSQL-like26languageforextractinginformationfromtheweb.Itscapabilitiesforperformingnavigationofweb27makeitausefultoolforautomatingseveralweb-relatedtasksthatrequirethesystematicprocessingofeitherailthelinksina28allthepagesthatcanbereachedfromagivenURLthrough29thatmatcha’patternoracombinationofboth.WebSQLalsoprovidestransparentaccesstoindexserversthatcanbequeriedviatheCommon30Interface. 30是
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