“J-carrier system”的概念、定义、翻译、参考文献-科学参考

单词	J-carrier system
释义	J-carrier system [`jā ¦kar·ē·ǝr ´sis·tǝm] ^{COMMUNICATIONS} Broad-band carrier system, providing 12 telephone channels, which uses frequencies up to about 140 kilohertz by means of effective four-wire transmission on a single open-wire pair.
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