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【单选题】
M点高程H m =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h MN 和待求点N的高程H N 分别为：（）A.
1.283m，44.534m
B.
-3.283m，39.968m
C.
3.283m，46.534m
D.
-1.283m，41.968m
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举一反三
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