单项选择题
A.data parity
B.analog loop back
C.local digital loop back
D.remote digital loop back
单项选择题 Acomputerbootsupwiththeerror"CMOSChecksumFailure."Whichofthefollowingcomponentsneedstobereplaced？（）
单项选择题 AnA+CertifiedTechnicianMUSTdoaninstallonaWindowsXPsystemfromthedistributionCD.However，thesystemdoesnotbootfromthisCD.WhatistheMOSTlikelycauseofthisproblem？（）
单项选择题 WhichofthefollowingisNOTaphaseofthetroubleshootingprocess？（）