break-to-make ratio of dial pulses的意思|示意
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拨号盘脉冲的破制比
break-to-make ratio of dial pulses的网络常见释义
拨号盘脉波断续比 ... 断续比 break-make ratio 拨号盘脉波断续比 break-to-make ratio of dial pulses 故障维修 breakdown maintenance ...