According to Dr. Chiu,what makes it possible to track down any paper work is to ______.A.m
According to Dr. Chiu,what makes it possible to track down any paper work is to ______.
A.make all the imperfections of machines deliberate
B.find out the guilty creator of the counterfeit document
C.allow more imperfectly designed printers to be sold
D.mark all the printers in a special and secret way