某钢尺尺长方程式为l=50.000m+0.0044m+1.25×10-5×(t-20)×50m,在温度为31.4℃和标准拉力下量得均匀坡度两点间的距离为49.9062m,高差为-0.705m。则该两点间的实际水平距离为:

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问题 某钢尺尺长方程式为l=50.000m+0.0044m+1.25×10-5×(t-20)×50m,在温度为31.4℃和标准拉力下量得均匀坡度两点间的距离为49.9062m,高差为-0.705m。则该两点间的实际水平距离为:

选项 A、49.904m
B、49.913m
C、49.923m
D、49.906m

答案B

解析 △l=×49.9062=0.0044m
Alt=1.25×10-5×(3.14-20)×49.9062=0.0071m
△lh==-0.0050m
l=49.9062+0.0044+0.0071+(-0.0050)=49.9127m=≈49.913m
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