polar-frequency pulse track circuit的意思|示意
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极频脉冲轨道电路
polar-frequency pulse track circuit的网络常见释义
极频轨道电路 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 ..