单项选择题
A.CMDCOMS
B.CHECKUPGRADEONLY
C.COPYSOURCE
D.DUPREPARE
单项选择题 Auserreportsthatthecomputerisrunningslowly.AfterrunningtheSFC，atechnicianobservesthatthedllcachefolderhasbecomecorrupted.Whichofthefollowingutilitiescanberuntorepairthecontentsofthedllcachedirectory？（）
单项选择题 AusersuspectsthatarecentlyinstalledprogramoverwroteaWindowssystemfileonthecomputer.Whichofthefollowingcommandscouldberuntocheckandverifythesystemfiles？（）
单项选择题 Whichofthefollowingcommandsareusedtocreatefoldersinacommandprompt？（）