单项选择题
A.Xenon
B.Halogen
C.Incandescent
D.Light Emitting Diode
单项选择题 Whenarrivingatthecustomerslocation，twodifferentusersdescribetheproblem，andfromtheirdescriptionitseemstobetwoseparateproblems.Whichofthefollowingisanappropriatesteptotake？（）
单项选择题 Whenonsiterepairingaprinterthetechnicianscellphoneringsanditisapersonalcall，howshouldthetechnicianhandlethis？（）
单项选择题 AtechnicianistroubleshootinganetworkconnectivityissueonaMFDandwouldliketoeliminatethepossibilityofanotherdeviceonthenetworkhavingthesameIPaddress.Thetechnicianshould：（）