“drop relay”的概念、定义、翻译、参考文献-科学参考

单词	drop relay
释义	drop relay [¦dräp `rē´lā] ^ELECTRICITY Relay activated by incoming ringing current to call an operator's attention to a subscriber's line.
随便看	Cydippida Cydippidea Cydnidae Cyg Cygnus Cygnus A Cygnus loop Cygnus X-1 Cygnus X-3 Cyg X-1 Cyg X-3 cyhexatin cylinder cylinder actuator cylinder block cylinder bore cylinder function cylinder gap cylinder head cylinder liner cylinder machine cylinder oil cylinder press cylinder stock cylinder stop

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