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21.What can we know about floating-point representation? A.It's widely used by digital devices. B.It causes calculating errors frequently. C.It pulses thousands of times a second. D.It makes characters readable for humans. 22.In which process does a stopwatch rounding error usually happen? A.When recording the oscillations of a quartz crystal. B.When counting the times of oscillations of a quartz crys- tal, C.When transforming the final count into a floating-point representation. D.When displaying the floating-point representation number