问题:
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,44.534mB . -3.283m,39.968mC . 3.283m,46.534mD . -1.283m,41.968m
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