参考答案:A设有双向闭塞设备的双线自动闭塞区间办理反方向行车前,列车调度员按规定发布反方向行车的调度命令,两端站车站值班员共同确认区间空闲后方可办理。
Why did the farmer say to the doctor "Here I am again"? Because he wanted to make the doctor believe that he was not ().
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