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当前学科：高级助理值班员
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在具备良好转接设备和通信记录装置条件下，对半自动区间（）的调度命令，车站值班员可使用列车无线调度通信设备向司机转达。
A . 使用故障按钮
B . 变更列车径路
C . 单机挂车
D . 超长列车头部越过出站信号机（未压上出站方面的轨道电路）发车
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