单项选择题
Which of the following is NOT a phase of the troubleshooting process？（）
A.confirm the repair B.define the problem C.document the results D.simplify the problem
单项选择题 WhatistheFIRSTandmostimportantstepinsystemtroubleshooting？（）
单项选择题 AdefectiveCD-ROMdriveisreplacedwithanewCD-ROMdrive.ThenewCD-ROMdriveisabletoreadanyCDthatitaccesses，butmusicCDsdonotplaymusic.WhatistheMOSTlikelycauseofthisproblem？（）
