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。则视线高程Hi和待求点N的高程HN分别为(  )。A45.534m;43.251mB40.968m;38.685mC44.251m;41.968mD42.251m;39.968m

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。则视线高程Hi和待求点N的高程HN分别为(  )。
A

45.534m;43.251m

B

40.968m;38.685m

C

44.251m;41.968m

D

42.251m;39.968m


参考解析

解析:
视线高程是指视准轴到绝对基面的垂直高度。通过视线高推算出待定点的高程,视线高程=后视点高程+后视读数。待定点高程=视线高程-前视读数。代入数据可得:Hi=HM+a=43.251+1.000=44.251m,HN=Hi-b=44.251-2.283=41.968m。

相关考题:

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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