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已知M点实地高程为39.651m,N点设计高程为40.921m。在M、N中间安置水准仪,读得M尺上读数为1.561m,N尺上读数为0.394m,则N点处填挖高度为()
A . 挖0.103m
B . 不填不挖
C . 填0.103m
D . 填1.270m
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