单项选择题

Acomputerbootsupwiththeerror'CMOSChecksumFailure.'Whichofthefollowingcomponentsneedstobereplaced？（）

A.powersupply
B.CMOSchip
C.motherboard
D.CMOSbattery

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单项选择题

AnA＋CertifiedTechnicianMUSTdoaninstallonaWindowsXPsystemfromthedistributionCD.However，thesystemdoesnotbootfromthisCD.WhatistheMOSTlikelycauseofthisproblem？（）

A.TheCDisdefective.
B.TheCDisnotbootable.
C.TheCD-ROMdriveisdefective.
D.TheBootSequenceisnotsetintheBIOStobootfirstfromtheCD

单项选择题

Ausercomplainsthatacomputermonitorisexperiencingajitter.Replacingthemonitorandvideocarddoesnotfixtheproblem.Whichofthefollowingcouldbecausingtheproblem？（）

A.ESD（electrostaticdischarge）
B.motherboard
C.RAMDAC
D.EMI（electromagneticinterference）