单项选择题
A.glass cleaner and paper towels B.dish soap and a wet towel C.a soft， pre-moistened towel or wipe D.dry paper towels
A.ink jet B.thermal C.impact D.laser
A.9 pin D-type B.36 pin Centronics C.25 pin Centronics D.13 pin D-type E.25 pin D-type