[单选题]

M点高程Hm=43.251m,测得后视读数a=1.000m,前视读数b=2.283m。则N点对M点的高差hMN和待求点N的高程HN分别为:()

A . 1.283m,44.534m

B . -3.283m,39.968m

C . 3.283m,46.534m

D . -1.283m,41.968m

参考答案与解析:

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