单选题Which of the following is a reason black toner is used in color printers？（）AIt decreases the print speed in color laser printers.BIt prevents moir patterns when printing color photographs.CIt reduces the cost per page when printing gray scale documents.DIt makes the color toner resistant to smudging when wet.
单选题
Which of the following is a reason black toner is used in color printers？（）
A
It decreases the print speed in color laser printers.
B
It prevents moir patterns when printing color photographs.
C
It reduces the cost per page when printing gray scale documents.
D
It makes the color toner resistant to smudging when wet.
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