![](https://static.youtibao.com/asksite/comm/h5/images/m_q_title.png)
[单选题]
允许速度为l20km/h(不含)~160km/h的线路,正线道岔(直向)与曲线超7坡终点之间的直线段长度不应小于(),困难条件下不应小于25 m。(A 、3、A)
A.30m
B.40m
C.50m
D.60m
![](https://static.youtibao.com/asksite/comm/h5/images/m_q_a.png)
B、40m
![](https://static.youtibao.com/asksite/comm/h5/images/solist_ts.png)
A.30m
B.40m
C.50m
D.60m
B、40m
A.1.0‰
B.3.0‰
C.4.0‰
D.5.0‰
A.0.7‰
B.0.8‰
C.0.9‰
D.1.0‰
A.线路允许速度大于160 km/h时不应小于100 m
B.线路允许速度为120(不含)~160km/h时不应小于50 m
C.线路允许速度为120(不含)~160km/h时困难条件下不应小于25 m
D.其他地段不应小于25 m