单项选择题
A user complains that a computer monitor is experiencing a jitter. Replacing the monitor and video card does not fix the problem. Which of the following could be causing the problem？（）
A.ESD（electrostatic discharge）
B.motherboard
C.RAMDAC
D.EMI（electromagnetic interference）
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单项选择题
AclientasksatechniciantoaddaDVD+Rburnertoacomputersystem.Thetechniciandoesthisandsuccessfullyteststhedrive.Threeweekslater，theclientcallsandsaysthattheburnerisnolongerworking.ThetechnicianlearnsthatthedrivereadsCDsandDVDs，butwillnolongerburnDVDs.Whenarrivingonsite，whatistheFIRSTactionthatthetechnicianshouldtake？（）
A.check for a faulty IDE cable
B.be sure that the DVD+R is formatted before using it
C.check for incompatible media
D.re-install the DVD burning software -
单项选择题
Whichcomponentsaredesignedtobeconvenientlyreplacedbyaservicetechnician？（）
A.SMDs（surface mounted devices）
B.FRUs（field replacement units）
C.FESs
D.BEMs -
单项选择题
Whichtestchecksthetransmitterandreceiverofalocalmodem？（）
A.data parity
B.analog loop back
C.local digital loop back
D.remote digital loop back
