单项选择题
An encoder sensor typically detects：（）
A.paper position.
B.shaft rotation.
C.magnetic flux.
D.laser beam strength.
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单项选择题
Whichofthefollowingfunctionsisassociatedwiththedeveloperunit？（）
A.Supplies toner to the photoconductor
B.Charges the surface of the photoconductor
C.Writes the latent image on the photoconductor
D.Cleans the photoconductor
