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【单选题】
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l t =30m+0．004m+0．0000125（t-20）×30m，则测设时在地面上多少？（）A.
49.546m
B.
49.571m
C.
49.531m
D.
49.568m
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皮皮学刷刷变学霸
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