Lb2A5151.带缓和曲线的圆曲线曲线长的计算公式为Ɩ=R(α-2β₀)×π/180°+2Ɩ₀,缓和曲线总切线角公式为β₀=180°Ɩ₀/2πR,若R=300m,Ɩ₀=30m,α=20°10′20″,则Ɩ为( )。
A.125.652m B.135.622m C.156.260m D.128.898m正确答案B
Lb2A5151.带缓和曲线的圆曲线曲线长的计算公式为Ɩ=R(α-2β₀)×π/180°+2Ɩ₀,缓和曲线总切线角公式为β₀=180°Ɩ₀/2πR,若R=300m,Ɩ₀=30m,α=20°10′20″,则Ɩ为( )。
A.125.652m B.135.622m C.156.260m D.128.898m正确答案B