单项选择题
A. renice 100 {PID}
B. renice -n 20 {PID}
C. renice --20 {PID}
D. renice -n -100 {PID}
单项选择题 PagereplacementsalgorithmstealsfilepagesonlywhenpercentofRAMoccupiedbyfilepages（）
单项选择题 WhichofthefollowingproceduresWILLNOTincreasecontiguousfreespaceonathefilesystem/data1，locatedon/dev/lv01，thatisheavilyfragmented？（）
单项选择题 ThesystemadministratornoticesthatthereisanI/Obottleneckononeofthreedisksindatavgvolumegroup.ThisproblemdiskcontainstheJFSlog，loglv00andonefilesystem，/mydatabase.Therearenootherlogicalvolumesonthisdisk.Whichofthefollowingoptionswouldbethebestsolution？（）