单选题 1分

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