英语词汇“key telephone equipment”的读音、翻译、释义、用法及例句-语文网

词汇	key telephone equipment
释义	key telephone equipment 按键电话设备一种使用继电器设备的按键电话机，可用来选择和保持专用交换机或中心局线路，并提供换线、占线和临时保持信号，也可用於拨号电话业务。
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