单项选择题

1.classTest{2.privateDemod；3.voidstart（）{4.d=newDemo（）；5.this.takeDemo（d）；6.}7.8.voidtakeDemo（Demodemo）{9.demo=null；10.demo=newDemo（）；11.}12.}WhenistheDemoobject，createdonline3，eligibleforgarbagecollection？（）
A.Afterline5.
B.Afterline9.
C.Afterthestart（）methodcompletes.
D.WhenthetakeDemo（）methodcompletes.
E.Whentheinstancerunningthiscodeismadeeligibleforgarbagecollection.

A.classTest{2.privateDemod；3.voidstart（）{4.d=newDemo（）；5.this.takeDemo（d）；6.}7.8.voidtakeDemo（Demodemo）{9.demo=null；10.demo=newDemo（）；11.}12.}WhenistheDemoobject，createdonline3，eligibleforgarbagecollection？（）
A.Afterline5.
B.Afterline9.
C.Afterthestart（）methodcompletes.
D.WhenthetakeDemo（）methodcompletes.
E.Whentheinstancerunningthiscodeismadeeligibleforgarbagecollection.

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问答题

YouaredevelopingaWindowsFormsApplicationbyusingthe.NETFramework3.5.YouplantocreateacustomizedPrintPreviewdialogboxintheapplication.Youneedtoensurethatuserscanpreviewtheirdocumentsbeforeprinting.Whichtwoactionsshouldyouperform？（）
A.AddaPrintPreviewDialogcontroltotheform.
B.AddaPrintPreviewControlcontroltotheform.
C.CreateandinitializeaPrintDocumentobjectontheformandthenimplementthePrintPageeventhandler.
D.CreateandinitializeaPrintDocumentobjectontheformandthenimplementtheBeginPrinteventhandler.
E.SettheDocumentpropertyofthePrintPreviewDialogcontroltothePrintDocumentinstancethatmustbe printed.

A.NETFramework3.5.YouplantocreateacustomizedPrintPreviewdialogboxintheapplication.Youneedtoensurethatuserscanpreviewtheirdocumentsbeforeprinting.Whichtwoactionsshouldyouperform？（）
A.AddaPrintPreviewDialogcontroltotheform.
B.AddaPrintPreviewControlcontroltotheform.
C.CreateandinitializeaPrintDocumentobjectontheformandthenimplementthePrintPageeventhandler.
D.CreateandinitializeaPrintDocumentobjectontheformandthenimplementtheBeginPrinteventhandler.
E.SettheDocumentpropertyofthePrintPreviewDialogcontroltothePrintDocumentinstancethatmustbe

单项选择题

Whiledesigningyourdatabase，youhavecreatedtheEMPLOYEEStableasanindexorganizedtable（IOT）.YouwanttocreateabitmapindexontheJOB_IDcolumntomakequeriesfaster.Whichtaskmusthavebeencompletedsothatyouareabletocreatethebitmapindex？（）
A.Aprimarykeymusthavebeencreated.
B.Amappingtablemusthavebeencreated.
C.Anoverflowtablespacemusthavebeenspecified.
D.ThePCTTHRESHOLDoptionmusthavebeenspecified.

A.YouwanttocreateabitmapindexontheJOB_IDcolumntomakequeriesfaster.Whichtaskmusthavebeencompletedsothatyouareabletocreatethebitmapindex？（）
A.Aprimarykeymusthavebeencreated.
B.Amappingtablemusthavebeencreated.
C.Anoverflowtablespacemusthavebeenspecified.
D.ThePCTTHRESHOLDoptionmusthavebeenspecified.