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° C,所用的钢尺的尺长方程式为lt=30m+0.004m+0.0000125(t-20)X30m,则测设时在地面上应量多少?
A.49. 546m B.49. 571m C.49. 531m D.49. 568m正确答案D
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° C,所用的钢尺的尺长方程式为lt=30m+0.004m+0.0000125(t-20)X30m,则测设时在地面上应量多少?
A.49. 546m B.49. 571m C.49. 531m D.49. 568m正确答案D