自动闭塞区间，超长列车头部越过发车进路信号机发出列车( )。A.调度命令 B.红色许可证 C.路票 D.绿色许可证

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问题自动闭塞区间，超长列车头部越过发车进路信号机发出列车( )。

选项 A.调度命令 B.红色许可证 C.路票 D.绿色许可证

答案 D

解析

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