【单选题】
列车运行途中司机发现客车车辆轮轴故障、车体下沉（倾斜）、车辆剧烈振动等危及行车安全的情况时，须立即采取停车措施，停车后由___负责检查处理。J371
A. 机车乘务员
B. 车辆乘务员
C. 车站（助理）值班员
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答案
B
解析
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容许信号显示一个___灯光——准许列车在通过色灯信号机显示红色灯光的情况下不停车，以不超过20 km/h的速度通过，运行到次一架通过信号机，并随时准备停车。J421
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