极频轨道电路 polar freguency coded track circuit;polar-frequency pulse track circuit 移频轨道电路 frequency shift track circuit;frequency-shift modulated track circuit 69 长轨道电路 long track circuit ..
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音频轨道电路 audio frequency track circuit 极频轨道电路 polar freguency coded track circuit;polar-frequencypulse track circuit 移频轨道电路 frequency shift track circuit;frequency-shiftmoduldined ond track circui...
基于10个网页-相关网页
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