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介绍了无绝缘移频轨道电路的类型以及轨道电路的计算依据和方法，并举例介绍了自然衰耗方式 18信息无绝缘移频轨道电路的实施方案。
This paper introduces the types of uninsulated frequency shift track circuits and the calculation basis and method of the track circuits, and gives an example to introduce the implementation scheme of natural attenuation mode 18 uninsulated frequency shift track circuits.