试题详情

M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Hi和待求点N的高程HN分别为(  )。

A45.534m;43.251m

B40.968m;38.685m

C44.251m;41.968m

D42.251m;39.968m