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polar impulse
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English
Chinese
commun., railw.
automatic block with polar frequency impulse track circuit
极频自动闭塞
tech.
polar impulse
极性脉冲
tech.
polar impulse
track circuit
极性脉冲轨道电路
commun., railw.
polar-impulse
track circuit
极性脉冲轨道电路
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