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jan 28, 1866 - 德国海克尔发表生物发生律。德国凯库勒提出苯的环状结构假说。

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1866年德国海克尔发表生物发生律。德国凯库勒提出苯的环状结构假说。

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jan 28, 1866

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~ 160 years ago

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