Which components are designed to be conveniently replaced by a service technician？（）

单项选择题Whichtestchecksthetransmitterandreceiverofalocalmodem？（）

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？（）

A.power supply
B.CMOS chip
C.motherboard
D.CMOS battery

单项选择题AnA+CertifiedTechnicianMUSTdoaninstallonaWindowsXPsystemfromthedistributionCD.However，thesystemdoesnotbootfromthisCD.WhatistheMOSTlikelycauseofthisproblem？（）

A.The CD is defective.
B.The CD is not bootable.
C.The CD-ROM drive is defective.
D.The Boot Sequence is not set in the BIOS to boot first from the CD

单项选择题WhichofthefollowingisNOTaphaseofthetroubleshootingprocess？（）

A.confirm the repair
B.define the problem
C.document the results
D.simplify the problem

单项选择题WhatistheFIRSTandmostimportantstepinsystemtroubleshooting？（）

A.back up the system data
B.gather information about the problem
C.try rebooting the system to see if that fixes the problem
D.check the System Error Log or Event Log