交流计数电码自 动闭塞 ac counting coded track circuit: 交流计数电码轨道电路automatic block with coded track circuit: 电码自动闭塞ac power frequency track circuit: 交流工频轨道电路reversed code track circuit: 反射电码轨道电路track circuit permissive block: 有轨道电路的容许闭塞下载手机词典可随时随地查词查翻译