题目内容
(请给出正确答案)
[单选题]
Lb3A4149.带缓和曲线的圆曲线切垂距的计算公式为m=Ɩ₀/2-Ɩ₀³/240R²,若R=1000m,Ɩ₀=70m,则切垂距为()
A.35.0000m
B.34.9900m
C.34.9986m
D.34.9990m
答案
C、34.9986m
A.35.0000m
B.34.9900m
C.34.9986m
D.34.9990m
C、34.9986m
第3题
A.0.2041
B.0.2042
C.0.4166m
D.0.4167m
第4题
A.当α=20°10′20″时,E=4.840m
B.当α=20°10′20″时,E=4.836m
C.当α=30°10′20″时,E=4.836m
D.当α=30°10′20″时,E=4.886m
E.当α=30°10′20″时,E=10.838m