下面哪些不是数据库的物理结构设计的内容？

系统设计阶段中进行新系统边界分析的目的是（）

对输入数据，通过计算记录个数来检查记录有无遗漏和重复的校验方法是（）

在关系数据库设计中，设计关系模式是数据库设计中哪个阶段的任务？

磁盘文件是一种（）

输出设计应由（）

下面哪种文件不属于按文件组织方式分类的？

老师问：“一张桌子四个角，锯掉一个角，还剩几个角？”有同学回答：“三个角。”这位同学解决问题时手哪种因素的影响（）

表象往往只反映事物的主要特征，这表明表象具有（）

谢帕德（R．N．Shepard）和库柏（L．A．Cooper）的“心理旋转”实验主要说明了表象具有（）

利用已有的知识经验，从问题提供的各种信息中寻找最佳答案的思维方式是（）

网络营销计划的第六个步骤是

将组合的收益rc=y*rp+(1-y)*rf和组合的风险σc=y*σp，代入效用函数公式U=E(r)-A/2σ*σ,然后求这个函数的最大值时得到最优的y，以下理解最优y正确的是

6.HowtoWorkFromHomeHereisamodestguidetobecomingasuccessfulremoteemployee,aculminationofwhatI’velearnedalongtheway.Don’tsleepwhereyouwork.Whetherit’sarentedofficespaceoradenconvertedintoahomeofficeoracabininthewoodsforthatmatter,findaspaceawayfromyourbedroomtowork.Getintoyourgroove.“Havingaconsistentscheduleandbeingkindofstrictaboutitisreallyusefulfordrawingoutlinesaroundyourtimesothatyoucankeepthingsbalancedforbothworkandplay,”saidJacquiCheng,editorinchiefofWirecutter,andsomeonewho’sworkedfromhomefulltimeforover12years.Planagainstdistractions.Setboundariesifyou’reworkingathomebyexplainingtofamilymembersorchildrenthatyourworkareaisofflimits,andtheyshouldavoidinterruptingunlessit’simportant.Tryingtomixworkandfreetimerunsthedangerofneverquitepoweringdownorshuttingoff,andcanleadtoburnoutanddepressionfromfeelinglikeyou’realwaysonandavailable.Toboot,yourfriendsandfamilymissoutonthetimeyouwouldspendwiththemifyouworkedinanofficeinsteadofathome.Makesuretoenforceyourboundaries.Question:Thislittlebookrepresentedthe____of15years'work.

6.InJune2016,theUnitedKingdomvotedtoleavetheEuropeanUnioninanuproar.ThenthePrimeMinisterDavidCameronresigned,andTheresamaywonthecontestfortheleadershipoftheconservativeparty.Anewwordisbeginningtoappearintheheadlines:‘Britain+exit=Brexit’."We'reinunchartedterritory."ThatiswhatanaideworkinginUKPrimeMinisterDavidCameron'sofficetoldreportersaftertheresultsofaBritishreferendumonEuropeanUnion(EU)membershipcameoutonJune242016.TheUK'shistoricvotetoexittheEUhasleftpeopleinshockandstirredanxietyacrosstheglobe.Eveniftheproceedingswon'tbefinalizedforanothertwoyears,theimpactshavealreadybeguntoshow.Forstarters,ifnotfor"Brexit",theEnglishsoccerteam'sdefeatintheEuroCuponJune28mightnothavebeensobitter.ButsoccerfansmockedthefactthatEnglandwasbeingdumpedbyEuropetwiceinaweek–intheprocess,losingbothitsPrimeMinisterandnationalsoccerteammanager.ThatEnglandmetdefeatatthehandsofIcelandwasalsoasourceofhumor."Thebeautifulirony.EnglandknockedoutofEuro2016bycountrynotevenintheEU!Maybethat’swhytheypressedtheBrexitbutton,"jokedoneTwitteruser.TheBritisheconomyfacesmoreseriouseffects.Thevotecreatedthebiggestglobalfinancialshocksincethe2008economiccrisis.Thepoundsuffereditsmostdramaticone-dayfallinhistory,plungingmorethan10percentagainstthedollartohitlevelslastseenin1985.Londonmightloseitsstatusasaglobalfinancialcapital.QuittingtheEUcouldalsocosttheUKaccesstotheEU'stradebarrier-freesinglemarketandmeansthatitmustseeknewtradeaccordswithcountriesaroundtheworld,Reutersreports.USPresidentBarackObamasaystheUKwouldbeatthe"backofaqueue"foraUSpact.Thereferendum'ssurprisingresultsshowadivisioninBritishsocietybetweentheoldergeneration–whobacked"Brexit"becausetheybelievedtheysawnobenefitsfromUK'sethnicdiversityandfree-marketeconomy–andtheyoungergeneration,whofavorglobalizationandtheborder-freepolicy.ChinaDaily'sUKeditorJonLowearguesthatasecond,equallyfundamentalsplitwasrevealedinthevotingresults.Hesaysthere'sagapbetweenwhatBritonsthoughttheywereandwhattheyreallyare."Farfrombeinganationofmodern,sophisticated,multiculturalgo-getters,itturnsoutwearestillacountryofbeer-swillingbumpkinswithadistasteforforeignersandadeepmistrustofEuropeanpowers,"Lowewrote.QuestionSix:WhathappenedtotheBritisheconomywhenthereferendumcameout?