试题详情

已知水准点高程HM=43.251m,测得后视读数a=1.000m,前视读数b=2.283m。则视线高 H、N点对M点的高差hMN和待求点N的高程HN分别为( )

A45.534m

B40.968m

C44.251m

D42.251m