单项选择题
A.The paper feed section
B.The fuser section
C.The scanner section
D.The transfer section
单项选择题 Apolygonmirrorispartofwhichofthefollowingassemblies？（）
单项选择题 Acustomerhasinstalledanewcomputerontheirnetwork.Theycanprinttotheprinterbuttheoptionforduplexprintingisnotavailable.Allothercomputershavetheoption.Whichofthefollowingisthecauseoftheproblem？（）
单项选择题 Whenisitadvisabletodumpthewastetonerfromatechniciansservicevacuum？（）