下列有关外观属性、样式、效果和层描述不正确的是（）
A. 外观属性包括填充、边线、透明和效果
B. 样式是一系列外观属性的集合
C. 当文件中只有一个图层时，不能删除此层
D. 效果不是外观属性的一种形式
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Youwererecentlyhiredbyanorganizationasadatabaseadministrator.Youareaskedtofindoutwhetherthecurrentlyfunctionallistenerprocess，namedL1，hasbeenpasswordprotectedornot.Youarenotfamiliarwiththefilesystemoftheneworganization.Howwouldyouaccomplishthetask？（）
A. byusingtheSTATUScommandoftheListenercontrolutility
B. byusingtheSTATUSL1commandoftheListenercontrolutility
C. byusingtheSHOWRULEScommandoftheListenercontrolutility
D. byusingtheSETPASSWORDcommandoftheListenercontrolutility
E. bysearchingforthePASSWORD_LISTENERentryinthelistener.orafile
三段论的式有（）个。
A. 64
B. 128
C. 256
D. 512
Adatafilebecamecorruptedinyourdatabaseduetobadsectorsonthedisk.Becauseofcorruption，youlostalltheimportanttablesinthatdatafile.Whichmethodwouldyouuseforrecovery？（）
A. flashbackallthetablesinthedatafile，onebyone
B. restorethedatafiletoanewlocationandperformamediarecovery
C. flashbackthedatabasethereisnoneedtorestorethedatafile
D. restorethedatafilefromthemostrecentbackupandflashbackthedatabase
WhilecreatingaschedulerwindowusingtheDBMS_SCHEDULERpackage，auserloggedinasDBMGRgetstheerrormessageinsufficientprivileges.Whichtwocommandswouldyouusetoresolvethiserror？（）
A. GRANTdbaTOdbmgr
B. GRANTconnectTOdbmgr
C. GRANTresourceTOdbmgr
D. GRANThs_admin_roleTOdbmgr
E. GRANTmanageschedulerTOdbmgr
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