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从下列叙述中选出5条正确的叙述并把编号按从小到大次序排列它们是5152535455 55处填
下面是关于树和线性结构的描述 线性结构存在惟一的没有前驱的14树存在惟一的没有前驱的15线性结构存在惟一的没有后继的16树存在多个没有后继的17线性结构其余元素均存在18树其余结点均存在19 由此可见由于线性结构是一个20结构元素之间存在的是21的关系而树是一个22结构元素之间存在的是23的关系 14处填
多媒体计算机中的媒体信息是指24多媒体技术的主要特性有25目前音频卡具备的功能有26在多媒体计算机中常用的图像输入设备是27国际标准MPEG-2采用了分层的编码体系提供了4种技术它们是28 26处填
Comparisonsweredrawnbetweenthedevelopmentoftelevisioninthe20thcenturyandthediffusionofprintinginthe15thand16thcenturies.Yetmuchhadhappenedbetween.Aswasdiscussedbeforeitwasnotuntilthe19thcenturythatthenewspaperbecamethedominantpre-electronic61followinginthewakeofthepamphletandthebookandinthe62oftheperiodical.Itwasduringthesametimethatthecommunicationsrevolution63UPbeginningwithtransporttherailwayandleadingonthroughthetelegraphthetelephoneradioandmotionpicturesintothe20th-centuryworldofthemotorcarandtheairplane.Noteveryoneseesthatprocessin64.Itisimportanttodoso. Itisgenerallyrecognized65thattheintroductionofthecomputerintheearly20thcentury66bytheinventionoftheintegratedcircuitduringthe1960sradicallychangedtheprocessalthoughitsimpactonthemediawasnotimmediately67.Astimewentbycomputersbecamesmallerandmorepowerfulandtheybecame"personal"tooaswellas68withdisplaybecomingsharperandstorage69increasing.Theywerethoughtoflikepeople70generationswiththedistancebetweengenerationsmuch71. Itwaswithinthecomputeragethattheterm"informationsociety"begantobewidelyusedtodescribethe72withinwhichwenowlive.Thecommunicationsrevolutionhas73bothworkandleisureandhowwethinkandfeelbothaboutplaceandtimebuttherehavebeen74viewaboutitseconomicpoliticalsocialandculturalimplications."Benefits"havebeenweighed75"harmful"outcomes.Andgeneralizationshaveproveddifficult. 72处填
Comparisonsweredrawnbetweenthedevelopmentoftelevisioninthe20thcenturyandthediffusionofprintinginthe15thand16thcenturies.Yetmuchhadhappenedbetween.Aswasdiscussedbeforeitwasnotuntilthe19thcenturythatthenewspaperbecamethedominantpre-electronic61followinginthewakeofthepamphletandthebookandinthe62oftheperiodical.Itwasduringthesametimethatthecommunicationsrevolution63UPbeginningwithtransporttherailwayandleadingonthroughthetelegraphthetelephoneradioandmotionpicturesintothe20th-centuryworldofthemotorcarandtheairplane.Noteveryoneseesthatprocessin64.Itisimportanttodoso. Itisgenerallyrecognized65thattheintroductionofthecomputerintheearly20thcentury66bytheinventionoftheintegratedcircuitduringthe1960sradicallychangedtheprocessalthoughitsimpactonthemediawasnotimmediately67.Astimewentbycomputersbecamesmallerandmorepowerfulandtheybecame"personal"tooaswellas68withdisplaybecomingsharperandstorage69increasing.Theywerethoughtoflikepeople70generationswiththedistancebetweengenerationsmuch71. Itwaswithinthecomputeragethattheterm"informationsociety"begantobewidelyusedtodescribethe72withinwhichwenowlive.Thecommunicationsrevolutionhas73bothworkandleisureandhowwethinkandfeelbothaboutplaceandtimebuttherehavebeen74viewaboutitseconomicpoliticalsocialandculturalimplications."Benefits"havebeenweighed75"harmful"outcomes.Andgeneralizationshaveproveddifficult. 68处填
TheCPUdoesnothavetolook6allofRAMtofindthespotitneeds.ButRAMonly7thedatatemporarily.Assoonasyouswitchthecomputer8allthatinformationdisappearsfromtheRAM.WhenyouswitchthecomputeronagaintheRAMis9andready10anewprogramandnewdata. 10处填
从下列叙述中选出5条正确的叙述并把编号按从小到大次序排列它们是5152535455 53处填
某工作站采用时钟频率f为15MHz处理速率为10MIP/S的处理机来执行一个已知混合程序假定每次存储器存取为1周期延迟此计算机的有效CPI是33假定将处理机的时钟频率厂提高到30MHz但存储器子系统速率不变这样每次存储器存取需要两个时钟周期如果30%指令每条只需要一次存储存取而另外5%每条需要两次存储存取还假定已知混合程序的指令数不变并与原工作站兼容则改进后的处理机性自34 34处填
从下列叙述中选出5条正确的叙述并把编号按从小到大次序排列它们是5152535455 51处填
TheCPUdoesnothavetolook6allofRAMtofindthespotitneeds.ButRAMonly7thedatatemporarily.Assoonasyouswitchthecomputer8allthatinformationdisappearsfromtheRAM.WhenyouswitchthecomputeronagaintheRAMis9andready10anewprogramandnewdata. 8处填
表示实体类型及实体间联系的模型称为数据模型其中关系模型主要特征是用43表示实体集44表示实体间联系关系运算以关系代数为理论基础关系代数的最基本操作是并差笛卡尔积45完整性规则提供了一种手段来保证当授权用户对数据库作修改时不会破坏数据的一致性关系模型的完整性规则是对关系的某种约束条件其中参照完整性要求46假设关系R的属性F是关系S的外码在对关系R和S的操作中不可能破坏参照完整性的是47 44处填
多媒体计算机中的媒体信息是指24多媒体技术的主要特性有25目前音频卡具备的功能有26在多媒体计算机中常用的图像输入设备是27国际标准MPEG-2采用了分层的编码体系提供了4种技术它们是28 28处填
多媒体计算机中的媒体信息是指24多媒体技术的主要特性有25目前音频卡具备的功能有26在多媒体计算机中常用的图像输入设备是27国际标准MPEG-2采用了分层的编码体系提供了4种技术它们是28 24处填
TheCPUdoesnothavetolook6allofRAMtofindthespotitneeds.ButRAMonly7thedatatemporarily.Assoonasyouswitchthecomputer8allthatinformationdisappearsfromtheRAM.WhenyouswitchthecomputeronagaintheRAMis9andready10anewprogramandnewdata. 6处填
Comparisonsweredrawnbetweenthedevelopmentoftelevisioninthe20thcenturyandthediffusionofprintinginthe15thand16thcenturies.Yetmuchhadhappenedbetween.Aswasdiscussedbeforeitwasnotuntilthe19thcenturythatthenewspaperbecamethedominantpre-electronic61followinginthewakeofthepamphletandthebookandinthe62oftheperiodical.Itwasduringthesametimethatthecommunicationsrevolution63UPbeginningwithtransporttherailwayandleadingonthroughthetelegraphthetelephoneradioandmotionpicturesintothe20th-centuryworldofthemotorcarandtheairplane.Noteveryoneseesthatprocessin64.Itisimportanttodoso. Itisgenerallyrecognized65thattheintroductionofthecomputerintheearly20thcentury66bytheinventionoftheintegratedcircuitduringthe1960sradicallychangedtheprocessalthoughitsimpactonthemediawasnotimmediately67.Astimewentbycomputersbecamesmallerandmorepowerfulandtheybecame"personal"tooaswellas68withdisplaybecomingsharperandstorage69increasing.Theywerethoughtoflikepeople70generationswiththedistancebetweengenerationsmuch71. Itwaswithinthecomputeragethattheterm"informationsociety"begantobewidelyusedtodescribethe72withinwhichwenowlive.Thecommunicationsrevolutionhas73bothworkandleisureandhowwethinkandfeelbothaboutplaceandtimebuttherehavebeen74viewaboutitseconomicpoliticalsocialandculturalimplications."Benefits"havebeenweighed75"harmful"outcomes.Andgeneralizationshaveproveddifficult. 64处填
设T是正则二叉树有6个叶子结点那么树T的高度最多可以是1最小可以是2树T的内结点数是3如果T又是Huffman最优树且每个叶子结点的权分别是1234556则最优树T的非叶子结点的权之和是4权为1的叶子结点的高度是5注树的根结点高度为1 4处填
下面是关于树和线性结构的描述 线性结构存在惟一的没有前驱的14树存在惟一的没有前驱的15线性结构存在惟一的没有后继的16树存在多个没有后继的17线性结构其余元素均存在18树其余结点均存在19 由此可见由于线性结构是一个20结构元素之间存在的是21的关系而树是一个22结构元素之间存在的是23的关系 18处填
Structuredprogrammingpractices71risetoPascalinwhichconstructswereintroducedtomakeprogramsmorereadableandbetter72Cprovidedacombinationofassemblyandhigh-levelstructuretocreateageneral-purposelanguagethatcouldbeusedfromsystemto73programming.Nextcameobjectorientationwhichis74ofametrologyanddesignphilosophythanalanguageissue.Thisis75bytheadditionofso-calledOOextensionstocurrentlanguagesuchasC++. 75处填
Comparisonsweredrawnbetweenthedevelopmentoftelevisioninthe20thcenturyandthediffusionofprintinginthe15thand16thcenturies.Yetmuchhadhappenedbetween.Aswasdiscussedbeforeitwasnotuntilthe19thcenturythatthenewspaperbecamethedominantpre-electronic61followinginthewakeofthepamphletandthebookandinthe62oftheperiodical.Itwasduringthesametimethatthecommunicationsrevolution63UPbeginningwithtransporttherailwayandleadingonthroughthetelegraphthetelephoneradioandmotionpicturesintothe20th-centuryworldofthemotorcarandtheairplane.Noteveryoneseesthatprocessin64.Itisimportanttodoso. Itisgenerallyrecognized65thattheintroductionofthecomputerintheearly20thcentury66bytheinventionoftheintegratedcircuitduringthe1960sradicallychangedtheprocessalthoughitsimpactonthemediawasnotimmediately67.Astimewentbycomputersbecamesmallerandmorepowerfulandtheybecame"personal"tooaswellas68withdisplaybecomingsharperandstorage69increasing.Theywerethoughtoflikepeople70generationswiththedistancebetweengenerationsmuch71. Itwaswithinthecomputeragethattheterm"informationsociety"begantobewidelyusedtodescribethe72withinwhichwenowlive.Thecommunicationsrevolutionhas73bothworkandleisureandhowwethinkandfeelbothaboutplaceandtimebuttherehavebeen74viewaboutitseconomicpoliticalsocialandculturalimplications."Benefits"havebeenweighed75"harmful"outcomes.Andgeneralizationshaveproveddifficult. 62处填
设T是正则二叉树有6个叶子结点那么树T的高度最多可以是1最小可以是2树T的内结点数是3如果T又是Huffman最优树且每个叶子结点的权分别是1234556则最优树T的非叶子结点的权之和是4权为1的叶子结点的高度是5注树的根结点高度为1 2处填
下面是关于树和线性结构的描述 线性结构存在惟一的没有前驱的14树存在惟一的没有前驱的15线性结构存在惟一的没有后继的16树存在多个没有后继的17线性结构其余元素均存在18树其余结点均存在19 由此可见由于线性结构是一个20结构元素之间存在的是21的关系而树是一个22结构元素之间存在的是23的关系 22处填
下面是关于树和线性结构的描述 线性结构存在惟一的没有前驱的14树存在惟一的没有前驱的15线性结构存在惟一的没有后继的16树存在多个没有后继的17线性结构其余元素均存在18树其余结点均存在19 由此可见由于线性结构是一个20结构元素之间存在的是21的关系而树是一个22结构元素之间存在的是23的关系 20处填
设有关系模式SSnoSnamePnoPnameQA表示销售员销售商品情况其中各属性的含义是Sno为销售员员工号Sname为销售员姓名Pno为商品号Pname为商品名称Q为销售商品数目A为销售商品总金额根据定义有如下函数依赖集P=sno→SnameSno→QSno→APno→Pname 关系模式S的关键字是38W的规范化程度最高达到39若将关系模式S分解为3个关系模式S1SnoSnameQAS2SnoPnoPname则S1的规范化程度最高达到40S2的规范化程度最高达到41 SQL中集合成员资格的比较操作“元组IN集合”中的“IN”与42操作符等价 40处填
下面是关于树和线性结构的描述 线性结构存在惟一的没有前驱的14树存在惟一的没有前驱的15线性结构存在惟一的没有后继的16树存在多个没有后继的17线性结构其余元素均存在18树其余结点均存在19 由此可见由于线性结构是一个20结构元素之间存在的是21的关系而树是一个22结构元素之间存在的是23的关系 16处填
设有关系模式SSnoSnamePnoPnameQA表示销售员销售商品情况其中各属性的含义是Sno为销售员员工号Sname为销售员姓名Pno为商品号Pname为商品名称Q为销售商品数目A为销售商品总金额根据定义有如下函数依赖集P=sno→SnameSno→QSno→APno→Pname 关系模式S的关键字是38W的规范化程度最高达到39若将关系模式S分解为3个关系模式S1SnoSnameQAS2SnoPnoPname则S1的规范化程度最高达到40S2的规范化程度最高达到41 SQL中集合成员资格的比较操作“元组IN集合”中的“IN”与42操作符等价 38处填
Comparisonsweredrawnbetweenthedevelopmentoftelevisioninthe20thcenturyandthediffusionofprintinginthe15thand16thcenturies.Yetmuchhadhappenedbetween.Aswasdiscussedbeforeitwasnotuntilthe19thcenturythatthenewspaperbecamethedominantpre-electronic61followinginthewakeofthepamphletandthebookandinthe62oftheperiodical.Itwasduringthesametimethatthecommunicationsrevolution63UPbeginningwithtransporttherailwayandleadingonthroughthetelegraphthetelephoneradioandmotionpicturesintothe20th-centuryworldofthemotorcarandtheairplane.Noteveryoneseesthatprocessin64.Itisimportanttodoso. Itisgenerallyrecognized65thattheintroductionofthecomputerintheearly20thcentury66bytheinventionoftheintegratedcircuitduringthe1960sradicallychangedtheprocessalthoughitsimpactonthemediawasnotimmediately67.Astimewentbycomputersbecamesmallerandmorepowerfulandtheybecame"personal"tooaswellas68withdisplaybecomingsharperandstorage69increasing.Theywerethoughtoflikepeople70generationswiththedistancebetweengenerationsmuch71. Itwaswithinthecomputeragethattheterm"informationsociety"begantobewidelyusedtodescribethe72withinwhichwenowlive.Thecommunicationsrevolutionhas73bothworkandleisureandhowwethinkandfeelbothaboutplaceandtimebuttherehavebeen74viewaboutitseconomicpoliticalsocialandculturalimplications."Benefits"havebeenweighed75"harmful"outcomes.Andgeneralizationshaveproveddifficult. 70处填
Comparisonsweredrawnbetweenthedevelopmentoftelevisioninthe20thcenturyandthediffusionofprintinginthe15thand16thcenturies.Yetmuchhadhappenedbetween.Aswasdiscussedbeforeitwasnotuntilthe19thcenturythatthenewspaperbecamethedominantpre-electronic61followinginthewakeofthepamphletandthebookandinthe62oftheperiodical.Itwasduringthesametimethatthecommunicationsrevolution63UPbeginningwithtransporttherailwayandleadingonthroughthetelegraphthetelephoneradioandmotionpicturesintothe20th-centuryworldofthemotorcarandtheairplane.Noteveryoneseesthatprocessin64.Itisimportanttodoso. Itisgenerallyrecognized65thattheintroductionofthecomputerintheearly20thcentury66bytheinventionoftheintegratedcircuitduringthe1960sradicallychangedtheprocessalthoughitsimpactonthemediawasnotimmediately67.Astimewentbycomputersbecamesmallerandmorepowerfulandtheybecame"personal"tooaswellas68withdisplaybecomingsharperandstorage69increasing.Theywerethoughtoflikepeople70generationswiththedistancebetweengenerationsmuch71. Itwaswithinthecomputeragethattheterm"informationsociety"begantobewidelyusedtodescribethe72withinwhichwenowlive.Thecommunicationsrevolutionhas73bothworkandleisureandhowwethinkandfeelbothaboutplaceandtimebuttherehavebeen74viewaboutitseconomicpoliticalsocialandculturalimplications."Benefits"havebeenweighed75"harmful"outcomes.Andgeneralizationshaveproveddifficult. 66处填
Comparisonsweredrawnbetweenthedevelopmentoftelevisioninthe20thcenturyandthediffusionofprintinginthe15thand16thcenturies.Yetmuchhadhappenedbetween.Aswasdiscussedbeforeitwasnotuntilthe19thcenturythatthenewspaperbecamethedominantpre-electronic61followinginthewakeofthepamphletandthebookandinthe62oftheperiodical.Itwasduringthesametimethatthecommunicationsrevolution63UPbeginningwithtransporttherailwayandleadingonthroughthetelegraphthetelephoneradioandmotionpicturesintothe20th-centuryworldofthemotorcarandtheairplane.Noteveryoneseesthatprocessin64.Itisimportanttodoso. Itisgenerallyrecognized65thattheintroductionofthecomputerintheearly20thcentury66bytheinventionoftheintegratedcircuitduringthe1960sradicallychangedtheprocessalthoughitsimpactonthemediawasnotimmediately67.Astimewentbycomputersbecamesmallerandmorepowerfulandtheybecame"personal"tooaswellas68withdisplaybecomingsharperandstorage69increasing.Theywerethoughtoflikepeople70generationswiththedistancebetweengenerationsmuch71. Itwaswithinthecomputeragethattheterm"informationsociety"begantobewidelyusedtodescribethe72withinwhichwenowlive.Thecommunicationsrevolutionhas73bothworkandleisureandhowwethinkandfeelbothaboutplaceandtimebuttherehavebeen74viewaboutitseconomicpoliticalsocialandculturalimplications."Benefits"havebeenweighed75"harmful"outcomes.Andgeneralizationshaveproveddifficult. 74处填
需要一个16MB×8位的存储器现有存储芯片为1MB×8位则需要2个存储器芯片存储器芯片的地址长度需要3位主存储器的地址长度需要4位 3处填
表示实体类型及实体间联系的模型称为数据模型其中关系模型主要特征是用43表示实体集44表示实体间联系关系运算以关系代数为理论基础关系代数的最基本操作是并差笛卡尔积45完整性规则提供了一种手段来保证当授权用户对数据库作修改时不会破坏数据的一致性关系模型的完整性规则是对关系的某种约束条件其中参照完整性要求46假设关系R的属性F是关系S的外码在对关系R和S的操作中不可能破坏参照完整性的是47 46处填
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