英语词汇“harmonic telephone ringer”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	harmonic telephone ringer
释义	harmonic telephone ringer harmonic telephone ringer [här′män·ik ′tel·ə‚fōn ‚riŋ·ər] (electronics) Telephone ringer which responds only to alternating current within a very narrow frequency band.
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