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当前学科:高级电力机车司机
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四显示自动闭塞区段发车进路色灯信号机显示(),准许列车运行到次一色灯信号机之前准备停车。
A . A、一个绿色灯光
B . B、一个黄色灯光
C . C、两个绿色灯光
D . D、一个绿色灯光和一个黄色灯光
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