英语词汇“radium clock”的意思、释义、用法解释及翻译-春雷网

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词汇	radium clock
释义	Definition of radium clock in English: radium clock noun rare A timing device in which beta particles from a radium source charge two electroscopic leaves, which discharge at regular intervals each time they diverge sufficiently to touch two earthed metal plates. Origin Early 20th century; earliest use found in Daily Herald (Decatur, Illinois). Definition of radium clock in US English: radium clock noun rare A timing device in which beta particles from a radium source charge two electroscopic leaves, which discharge at regular intervals each time they diverge sufficiently to touch two earthed metal plates. Origin Early 20th century; earliest use found in Daily Herald (Decatur, Illinois).
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