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【单选题】
某站水准测量时,由A点向B点进行测量,测得A点相对于B点的高差为429m,且A点水准尺的读数为1.378m,则B点水准尺的读数为A.
0.949mm
B.
1.807mm
C.
949mm
D.
1807mm
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