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打火石为什么能点起火了呢
更新时间: 2020-07-13 00:00:00  

打火石能点起火的原因:加热打火石稍加撞击会爆炸,制造打火石合金,广泛应用混合稀土金属,其中以铈为主。含有镧、镨、钕等轻稀土元素。利用稀土金属的化学性质活泼,对氧的亲和力强,而铈组金属的燃点温度很低并且燃烧时放出大量的热量。

关键词: 火石 为什么 起火

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