“direct-current quadruplex system”的概念、定义、翻译、参考文献-科学参考

单词	direct-current quadruplex system
释义	direct-current quadruplex system [dǝ¦rekt ¦kǝ·rǝnt `kwä·drǝ´pleks ´sis·tǝm] ^{COMMUNICATIONS} Direct-current telegraph system which affords simultaneous transmission of two messages in each direction over the same line, achieved by superimposing neutral telegraph upon polar telegraph.
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