单项选择题
Which of the following printers uses a charged drum to transfer toner to paper？（）
A.thermal B.laser C.ink jet D.impact
单项选择题 Whichofthefollowingitemcolorizesthepaperusingatwo-componentlaserprinter？（）
多项选择题 Whichofthefollowingprintersspraysthepaper？（）
单项选择题 Whichofthefollowingshouldatechnicianusetocleantheglassonaflatbedscanner？（）
