The part key circuit and software program block are given.
给出了部分关键电路连线图及软件程序模块。
The foundation of automatic block and cab signal is track circuit.
自动闭塞和机车信号的基础是轨道电路。
The block diagram of the circuit is given and its fundamental principle is analysed here.
给出控制电路图，并分析其原理。
The block diagram of the circuit is given and its fundamental principle is analysed here.
给出控制电路图，并分析其原理。
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