【单选题】
电话闭塞法行车时，同方向追踪列车的最小发车间隔（终端站除外）为___。
A. 两站两区间
B. 两站一区间
C. 一站两区间
D. 一站一区间
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答案
A
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因集中站信号设备故障采用电话闭塞法行车时，实施范围应为信号故障影响区段前后各增加___，作为电话闭塞法行车的起始与终止范围。
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