在C#中，基本的文件操作是由（）命名空间提供的类来实现的。

单项选择题关于编写货号的描述，以下哪个是正确的?()

单项选择题AwebbrowserneedNOTalwaysperformacompleterequestforaparticularpagethatitsuspectsmightNOThavechanged.TheHTTPspecificationprovidesamechanismforthebrowsertoretrieveonlyapartialresponsefromthewebserver；thisresponseincludesinformation，suchastheLast-ModifieddatebutNOTthebodyofthepage.WhichHTTPmethodwillthebrowserusetoretrievesuchapartialresponse？（）A.GETB.ASKC.SENDD.HEADE.TRACE

单项选择题现有：1.classBook{2.privatefinalvoidread（）{System.out.print（ book ）；}3.}4.classPageextendsBook{5.publicstaticvoidmain（String[]args）{6. insertcodehere7.}8.privatefinalvoidread（）{System.out.print（ page ）；}9.}和如下三个代码片段（x，y，z）：x. justacommenty.newPage（）.read（）；z.newBook（）.read（）；分别插入到第6行，有几个允许代码通过编译并可以运行且无异常？（）A.0B.1C.2D.3

单项选择题在保存图片时，要满足淘宝发布图片大小不大于120K的要求的最简便的方法是()

单项选择题1.publicinterfaceA{2.publicvoiddoSomething（Stringthing）；3.}1.publicclassAImplimplementsA{2.publicvoiddoSomething（Stringmsg）{}3.}1.publicclassB{2.publicAdoit（）{3. morecodehere4.}5.6.publicStringexecute（）{7. morecodehere8.}9.}1.publicclassCextendsB{2.publicAImpldoit（）{3. morecodehere4.}5.6.publicObjectexecute（）{7. morecodehere8.}9.}Whichstatementistrueabouttheclassesandinterfacesintheexhibit？（）

单项选择题Youconnectanexternalmonitortoaportablecomputer.Youneedtoincreasetheavailabledesktopareatoincludetheexternalmonitor.Whatshouldyoudo?（）

单项选择题YouaretheadministratoroftheCorparborshoes.com&en

单项选择题Company.comnetworkconsistsofasingleActiveDirectorydomainnamedCompany.com.Company.comhasanExchangeServer2010organization.YouhavereceivedinstructionsfromtheCIOtouseawildcardcertificateforOutlookAnywhere.YounowneedtosetuptheExchangeServer2010organizationforthewildcardcertificate.Whatshouldyoudo？（）A.ThebestoptionistochangetheRPCvirtualdirectoryfromtheInternetInformationServices（IIS）Manager.B.ThebestoptionistochangethepropertiesoftheWEBOutlookProviderfromtheExchangeManagementShell.C.ThebestoptionistochangetheRPCvirtualdirectoryfromtheAutodiscovervirtualdirectory.D.ThebestoptionistochangethepropertiesoftheEXPROutlookProviderfromtheExchangeManagementShell.

单项选择题YouhaveanexistingActiveDirectorysitenamedSite1.YoucreateanewActiveDirectorysiteandnameitSite2.YouneedtoconfigureActiveDirectoryreplicationbetweenSite1andSite2.Youinstallanewdomaincontroller.YoucreatethesitelinkbetweenSite1andSite2.Whatshouldyoudonext（）A.UsetheActiveDirectorySitesandServicesconsoletoconfigureanewsitelinkbridgeobject.B.UsetheActiveDirectorySitesandServicesconsoletodecreasethesitelinkcostbetweenSite1andSite2.C.UsetheActiveDirectorySitesandServicesconsoletoassignanewIPsubnettoSite2.MovethenewdomaincontrollerobjecttoSite2.D.UsetheActiveDirectorySitesandServicesconsoletoconfigurethenewdomaincontrollerasapreferredbridgeheadserverforSite1.

单项选择题YouworkinacompanywhichusesSQLServer2008.Youaretheadministratorofthecompanydatabase.NowyouareinchargeofaSQLServer2008instance.Therearequeriesthathaveanestimatedexecutioncostlessthan3.Youintendtoconfiguretheinstance,makeituseasinglethreadforthesequeries.Intheoptionsbelow,whichsp_configureconfigurationoptionshouldyouset?（）A.YoushouldsetquerygovernorcostlimitB.YoushouldsetcostthresholdforparallelismC.YoushouldsetpriorityboostD.Youshouldsetprecomputerank