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sep 28, 1883 - 德国康托尔建立集合论。美国爱迪生发现热电子发射现象。
Description:
1883年德国康托尔建立集合论。美国爱迪生发现热电子发射现象。
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鱼
2 May 2023
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Date:
sep 28, 1883
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~ 142 years ago
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