已知 M 点实地高程为 39.651m , N 点的设计高程为 40.921m 。当在 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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