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dragon229
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6 days ago
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Dieu aider le monde.
最初,火药是在寻找长生不老药的过程中被发明的。火药的最早配方记录出现在唐朝中期( 9世纪中期)。 火药的主要成分是硝石(硝酸钾)、硫磺和木炭。中国的炼金术士发现,这些成分混合后会产生爆炸效果。火药最初用于烟花和仪式用途,但很快其军事用途也被发现。在宋朝 (960–1279年)期…