图甲所示的实验用来测定空气中氧气的体积分数.实验时要先关闭止水夹将过量红磷在空气中点燃后迅速插入集气瓶中盖紧胶塞待红磷熄灭后冷却至室温 Template




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tomski图甲所示的实验用来测定空气中氧气的体积分数.实验时要先关闭止水夹将过量红磷在空气中点燃后迅速插入集气瓶中盖紧胶塞待红磷熄灭后冷却至室温 coloring