找考题网-背景图
单项选择题

"A、B、C三点为一条支水准路线,A高程HA=21.300m,往测高差为hAB=-1.557m,hBC=+1.114m,hCB=-1.116m,hBA=+1.561m,那么C点高程HC为()。"

A.20.957
B.21.744
C.20.856
D.21.745