| 字词 | keyless ringing |
| 释义 | keyless ringing 无键振铃 A manual switchboard facility whereby ringing is applied automatically as a result of the insertion of the calling plug into the jack of the called line. 一种手工操作的交换盘,把呼叫插头插入被呼叫线的插座时能自动产生振铃。 |
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