单项选择题
A. trb
B. his
C. f
D. trace
单项选择题 Asystemisexperiencingperformanceproblems.AftercheckingtheCPUusage,theproblemidentifiedisthatthesystemis"CPUBound".WhichofthefollowingoutcomeswilldetermineifthereisapossibleCPUconstraint?（）
单项选择题 Ifasystemadministratorwantstoshowonlyadiskreportfordisk2,attwosecondintervals,whatisthecorrectcommandtorun?（）
单项选择题 WhatdoestheFREQcolumnshowwhenrunningthetprofoption?（）