未知题型
YouareworkingonanOracleDatabase10gdatabase.Becauseofdataloss，youdecidedtoperformaFlashbackDatabaseoperationusingthefollowingcommand：SQL>FLASHBACKDATABASETOTIMESTAMP（SYSDATE？5/24）；Whichtwostatementsaretrue？（）A.SYSDATEshouldnotbeusedwithTIMESTAMP.B.Thedatabasemusthavemultiplexedredologfiles.C.ThedatabasemustbeintheMOUNTstatetoexecutethecommand.D.ThedatabasemustbeopenedwiththeRESETLOGSoptionaftertheflashbackoperation.E.Theentiredatabaseneedstoberestoredfromthemostrecentbackupbeforetheflashbackoperation.
C, D
未知题型 voidstart（）{13.Aa=newA（）；14.Bb=newB（）；15.a.s（b）；16.b=null；17.a=null；18.System.out.println（startcompleted”）；19.}WhenistheBobject，createdinline14，eligibleforgarbagecollection？（）
未知题型 Whichtwocreateaninstanceofanarray？（）
未知题型 Whichtwocauseacompilererror？（）
