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
正确答案及解析
正确答案
D
解析
提示:HB=HA+hAB=HA+(a-b)
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:
提示:HB=HA+hAB=HA+(a-b)