单项选择题
A.the distance between the spots.
B.which paper tray was used to print the document.
C.which driver was used to print the document.
D.which application was used to print the document.
单项选择题 Atechnicianreceivesadotmatrixprinterforrepairandtheworkorderstatesthattheprinterisonlyprintingone-halfofeachcharacter.Whichofthefollowingshouldthetechnicianreplace？（）
多项选择题 Whichofthefollowingisatypeofmotherboard？（）
单项选择题 Whichofthefollowingwouldbethecorrectwaytodisposeofalaptopbattery？（）