已知A点高程HA=72.445m,高差hBA=2.324m,则B点的高程HBO()

已知A点高程HA=72.445m,高差hBA=2.324m,则B点的高程HBO()

A.74.769m

B.70.121m

C.-74.769m

D.-70.121m

正确答案是B