單項(xiàng)選擇題某測(cè)站后視尺黑面的讀數(shù)為1762mm,紅面讀數(shù)為6446mm,則此水準(zhǔn)尺尺底紅面的刻劃值為()

A.4.768m
B.4.687m
C.4.787m
D.0m