760 用水準儀觀測分別置於A,B兩點上之水準尺,測讀出標尺讀數分別為1.423M及0.468M,若B點高程為144.624M,則A點高程是:(A)145.579 M(B)143.669 M(C)145.685 M(D)143.969 M