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【单选题】
某站水准测量时,由A点向B点进行测量,已知A点的高程为43.251m,测得后视读数为a=1.000m,前视读数为b=2.283m,则视线高Hi和待测点B的高程分别为A.
45.534m；43.251m
B.
40.968m；38.685m
C.
44.251m；41.968m
D.
42.251m；39.968m
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