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jan 1, 1822 - 法国安培发现安培定律，提出磁分子假说。德国夫琅和费创制光栅。

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1822年法国安培发现安培定律，提出磁分子假说。德国夫琅和费创制光栅。

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jan 1, 1822

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~ 204 years ago

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