direct-current ringer

基本解释直流振铃器

网络释义

1)direct-current ringer,直流振铃器2)DC signalling,直流振铃3)acldc ringing,交直流振铃4)direct current ringing,直流振铃<声>5)ac/dc ringing,交流/直流振铃6)DC ringing,直流振铃[电话]

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