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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AclientasksatechniciantoaddaDVD+Rburnertoacomputersystem.Thetechniciandoesthisandsuccessfullyteststhedrive.Threeweekslater，theclientcallsandsaysthattheburnerisnolongerworking.ThetechnicianlearnsthatthedrivereadsCDsandDVDs，butwillnolongerburnDVDs.Whenarrivingonsite，whatistheFIRSTactionthatthetechnicianshouldtake？（）
A.check for a faulty IDE cable
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B.FRUs（field replacement units）
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D.BEMs -
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Whichtestchecksthetransmitterandreceiverofalocalmodem？（）
A.data parity
B.analog loop back
C.local digital loop back
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