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。
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
D点高程,测得后视读数a=1.000m,前视读数b=2.283m。测视线高和待求点N的高程分别为( )。A、45、534m,43、25lmB、44、25lm,41、968mC、40、968m,38、685mD、42、251m,39、968m
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