2009-05-30 | 呵呵转载--铁路信号专业英语翻译3 ... 移频自动闭塞 frequency shift modulated automatic block;automatic block with audio frequency shift modulat 脉冲自动闭塞 pulse automatic block;automatic block with impulse track circuit 极频自动闭塞 polar frequency coded automatic block;automatic block with polar frequency impulse track ...
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