![](https://static.youtibao.com/asksite/comm/h5/images/m_q_title.png)
[单选题]
线路允许速度小于120km/h的线路,道岔基本轨顶面擦伤深度达到(),应及时修理或更换
A.0.5mm
B.1mm
C.1.5mm
D.2mm
![](https://static.youtibao.com/asksite/comm/h5/images/m_q_a.png)
D、2mm
![](https://static.youtibao.com/asksite/comm/h5/images/solist_ts.png)
A.0.5mm
B.1mm
C.1.5mm
D.2mm
D、2mm
线路允许速度()的区段,巡道、巡守人员在路肩上行走,并注意察看线路状态。
A.Vmax>200km/h
B.Vmax>160km/h
C.Vmax>140km/h
D.Vmax>120km/h
A.300
B.350
C.400
D.450