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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。
youdao
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This machine has a track, the block can be transported to truck or ship directly.
机器前端出包，辅以道轨，能直接上车上船。
youdao
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This machine has a track, the block can be transported to truck or ship directly.
机器前端出包，辅以道轨，能直接上车上船。
youdao