M点高程HM=43.251m，测得后视读数a=1.000m，前视读数b=2.283m。则视线高Hi和待求点N的高程分别为：
A.45. 534m,43. 251m B.40. 968m,38. 6S5m C.44. 251m,41. 968m D.42. 251m,39. 968m正确答案C
M点高程HM=43.251m，测得后视读数a=1.000m，前视读数b=2.283m。则视线高Hi和待求点N的高程分别为：
A.45. 534m,43. 251m B.40. 968m,38. 6S5m C.44. 251m,41. 968m D.42. 251m,39. 968m正确答案C
