[单选题]

M点高程HM=43.251m,测得后视读数a=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(  )。

A.45.534m;43.251m

B.40.968m;38.685m

C.44.251m;41.968m

D.42.251m;39.968m

参考答案与解析:

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