单项选择题

10.interfaceFoo{}11.classAlphaimplementsFoo{}12.classBe……

10.interfaceFoo{}11.classAlphaimplementsFoo{}12.classBetaextendsAlpha{}13.classDeltaextendsBeta{14.publicstaticvoidmain（String[]args）{15.Betax=newBeta（）；16.//insertcodehere17.}18.}Whichcode，insertedatline16，willcauseajava.lang.ClassCastException？（）
A.Alphaa=x；
B.Foof=（Delta）x；
C.Foof=（Alpha）x；
D.Betab=（Beta）（Alpha）x；

A.interfaceFoo{}11.classAlphaimplementsFoo{}12.classBetaextendsAlpha{}13.classDeltaextendsBeta{14.publicstaticvoidmain（String[]args）{15.Betax=newBeta（）；16.//insertcodehere17.}18.}Whichcode，insertedatline16，willcauseajava.lang.ClassCastException？（）
A.Alphaa=x；
B.Foof=（Delta）x；
C.Foof=（Alpha）x；
D.Betab=（Beta）（Alpha）x；

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单项选择题YouworkinacompanywhichusesSQLServer2008.Youaretheadministratorofthecompanydatabase.NowyouareinchargeofaSQLServer2008instance.ThereisadatabasenamedDB1intheinstance.TheDB1databaseincludesspatialdatatypes.OnDB1databse,youhavetoperformadatabaseconsistencychecktoincludethespatialindexes.Besidesthis,youmustmakesurethatyoucanreducetheeffectonthedatabaseconcurrencytotheleast.SowhichTransact-SQLstatementshouldyourun?（）A.DBCCCHECKCATALOG(DB1);B.DBCCCHECKALLOC(DB1)WITHTABLOCK;C.DBCCCHECKDB(DB1)WITHTABLOCK,PHYSICAL_ONLY;D.DBCCCHECKDB(DB1)WITHEXTENDED_LOGICAL_CHECKS;

A.Youaretheadministratorofthecompanydatabase.NowyouareinchargeofaSQLServer2008instance.ThereisadatabasenamedDB1intheinstance.TheDB1databaseincludesspatialdatatypes.OnDB1databse,youhavetoperformadatabaseconsistencychecktoincludethespatialindexes.Besidesthis,youmustmakesurethatyoucanreducetheeffectonthedatabaseconcurrencytotheleast.SowhichTransact-SQLstatementshouldyourun?（）
A.DBCCCHECKCATALOG(DB1);
B.DBCCCHECKALLOC(DB1)WITHTABLOCK;
C.DBCCCHECKDB(DB1)WITHTABLOCK,PHYSICAL_ONLY;
D.DBCCCHECKDB(DB1)WITHEXTENDED_LOGICAL_CHECKS;

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A.ThecompanyhasanActiveDirectoryforestthathasasingledomain.Eachofficehasonedomaincontroller.EachofficeisconfiguredasanActiveDirectorysite.AllsitesareconnectedwiththeDEFAULTIPSITELINKobject.Youneedtodecreasethereplicationlatencybetweenthedomaincontrollers.Whatshouldyoudo（）
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A.AllserversrunWindowsServer2008.YourcompanyusesanENterpriseRootcertificationauthority（CA）andanEnterpriseIntermediateCA.TheEnterpriseintermediateCAcertificateexpires.YouneedtodeployanewEnterpriseIntermediateCAcertificatetoallcomputersinthedomain.Whatshouldyoudo（）
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