列车运行中,听到响墩爆炸声及看到火炬信号的火光时应怎么办?
允许速度不超过160km/h的线路,辙叉趾、辙叉跟轨头及下颚部位裂纹长度超过()时,应及时更换。 ["A.10mm","B.20mm","C.30mm","D.40mm"]
进行盐水选种时,盐水比重为() ["1.3","1.13","1.5","1.6"]
允许速度不超过160km/h的线路,辙叉轮缘槽两侧纵向水平裂纹相加部分长度达()时,应及时更换。 ["A.100mm","B.150mm","C.200mm","D.250mm"]
作物茬口的好坏是针对() 而言的
列车在区间被迫停车后,如何设置响墩进行防护?