【填空题】
4.信号机设在列车运行方向的___或其所属线路的中心线上空。J71
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【填空题】
20.天气恶劣无法辨认出站___信号机显示时，在列车具备发车条件后，司机凭车站值班员列车无线调度通信设备的发车通知起动列车，在确认出站___信号机___后,再行加速。J338
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