单项选择题
A.ESD（electrostatic discharge）
B.motherboard
C.RAMDAC
D.EMI（electromagnetic interference）
单项选择题 AclientasksatechniciantoaddaDVD+Rburnertoacomputersystem.Thetechniciandoesthisandsuccessfullyteststhedrive.Threeweekslater，theclientcallsandsaysthattheburnerisnolongerworking.ThetechnicianlearnsthatthedrivereadsCDsandDVDs，butwillnolongerburnDVDs.Whenarrivingonsite，whatistheFIRSTactionthatthetechnicianshouldtake？（）
单项选择题 Whichcomponentsaredesignedtobeconvenientlyreplacedbyaservicetechnician？（）
单项选择题 Whichtestchecksthetransmitterandreceiverofalocalmodem？（）