单项选择题
A.errpt -d S
B.errclean 0
C.errclear -d S 0
D.errclean -d S 0
单项选择题 AsystemadministratorhasjustfinishedupgradingasystemtoAIX5.2.Iftherearefutureproblems，thesystemadministratorwouldliketoaddanentrytotheAIXerrorlogtorecordthisevent.Whichofthefollowingcommandscanbeissuedforthispurpose？（）
单项选择题 PerformancemonitoringofapoorlyperformingsystemindicatesahighlevelofCPUusage.WhichtoolcanbeusedtohelpidentifywhichprocessesareusingexcessiveCPUresources？（）
单项选择题 Asystemadministratorreceivedthefollowingmessagewhiletryingtosshtoaserver：connectiontimedout.Theadministratorpingedtheserverandhadnoresponse.Theadministratorthenpingedthegateway，andwassuccessful.Whichtoolcouldtheadministratorusenexttoisolatetheproblem？（）