单选：CTCS-2级区段，（）产生运行许可并连续向列车传送。A．轨道电路B．有源应答器C．无源应答器D．LEU

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题目类型：单选
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题目内容：

CTCS-2级区段，（）产生运行许可并连续向列车传送。
A．轨道电路
B．有源应答器
C．无源应答器
D．LEU

参考答案：

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