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jan 1, 1928 - 弗莱明发现青霉素；国民政府完成“二次北伐”

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亚历山大·弗莱明发现青霉素的杀菌作用。南京国民政府军队占领北京，张学良东北易帜，国民政府形式上统一全国。

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Date:

jan 1, 1928

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~ 98 years ago

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