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【单选题】
过生日时，父母为我们买来精美的蛋糕，插上漂亮的生日蜡烛。点燃后，让我们吹灭……，我们学化学的第一个实验，也是观察和描述蜡烛的燃烧。下图是实验中可以完成的几个步骤。请分析下列结论中不正确的是 [ ]A.
点燃蜡烛前要先观察蜡烛的物理性质
B.
由①可以清楚地观察到外焰温度最高
C.
由②可以说明蜡烛燃烧生成了二氧化碳
D.
由③可以证明蜡烛蒸气可以燃烧
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皮皮学刷刷变学霸
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