如何检验氢气在空气中的生成物?
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如何检验氢气在空气中的生成物?
如何检验氢气在空气中的生成物?
如何检验氢气在空气中的生成物?
是氢气在空气中燃烧的生成物吧,在火焰上方罩一个干冷的小烧杯,烧杯内壁出现小水滴,说明生成了水
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