“four-frequency diplex telegraphy”的概念、定义、翻译、参考文献-科学参考

单词	four-frequency diplex telegraphy
释义	four-frequency diplex telegraphy [¦fȯr ¦frē·kwǝn·sē ¦dī´pleks tǝ`leg·rǝ·fē] ^{COMMUNICATIONS} Frequency-shift telegraphy in which each of the four possible signal combinations corresponding to two telegraph channels is represented by a separate frequency.
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