... 中间交换节点 intermediate switching node 音频电路 voice-frequency circuit 汇接交换机 tandem switch ...
基于32个网页-相关网页
voice-frequency circuit-test unit 话频电路测试器
open-wire voice frequency circuit 明线话频线路
wire voice frequency circuit 明线话频线路
voice frequency wire circuit 音频有线电路
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