Generally less than 20 kHz frequency called Distribution Line Carrier [DLC] and the non-use permit is to allow, on the basis of non-interference in each other.是什么意思_Generally less than 20 kHz frequency called Distribution Line Carrier [DLC] and the non-use permit is to allow, on the basis of non-interference in each other.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句