问答题

Whichthreestatementsaretrueaboutthestagesofdatabasestartup？（）

A.DatafilesandredologfilescanberenamedattheMOUNTstage.
B.ControlfilesarereadattheOPENstageforthelocationofdatafiles.
C.ControlfilesarerequiredtobringthedatabasetotheNOMOUNTstage.
D.DatafilesandredologfilesaremadeavailabletousersattheOPENstage.
E.Datafilesandonlineredologfilesarecheckedforconsistencywhileopeningthedatabase

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问答题

WhichtwocreateanInputStreamandopenfilethe“file.txt”forreading？（）

A.InputStreamin=newFileReader（“file.txt”）；
B.InputStreamin=newFileInputStream（“file.txt”）；
C.InputStreamin=newInputStreamFileReader（“file.txt”，“read”）；
D.FileInputStreamin=newFileReader（newFile（“file.txt”））；
E.FileInputStreamin=newFileInputStream（newFile（“file.txt”））；

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Giventhefollowingcode，whichmethoddeclarations，wheninsertedattheindicatedposition，willnotcausetheprogramtofailcompilation？（）publicclassQdd1f{publiclongsum（longa，longb）{returna+b；}//insertnewmethoddeclarationhere}
A.publicintsum（inta，intb）{returna+b；}
B.publicintsum（longa，longb）{return0；}
C.abstractintsum（）；
D.privatelongsum（longa，longb）{returna+b；}
E.publiclongsum（longa，intb）{returna+b；}

A.publicintsum（inta，intb）{returna+b；}
B.publicintsum（longa，longb）{return0；}
C.abstractintsum（）；
D.privatelongsum（longa，longb）{returna+b；}
E.publiclongsum（longa，intb）{returna+b；}