单选题
D点高程H
m
=43.251m，测得后视读数a=1.000m，前视读数b=2.283m。则视线高H
i
和待求点N的高程分别为{{U}} {{/U}}。
A.45.534m，43.251m
B.44.251m，41.968m
C.40.968m，38.685m
D.42.251m，39.968m
A
B
C
D
【正确答案】
B
【答案解析】
H
i
=H
A
+a；H
B
=H
i
-b
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