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拟测设距离D=49.550m,两点间坡度均匀,高差为1.686m,丈量时的温度为27℃,所用的钢尺的尺长方程式为ι=30m+0.004m+0.0000125(t-20)×30m,则测设时在地面上应量多少?
A.49.546m
B.49.571m
C.49.531m
D.49.568m
参考答案:D
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