.下图所示的一组实验可用于研究燃烧条件。下列说法中,正确的是

.下图所示的一组实验可用于研究燃烧条件。下列说法中,正确的是

A.此组实验烧杯中的热水只起提高温度的作用

B.图1中铜片上的白磷和红磷对比说明燃烧必须有氧气

C.图1中铜片上的红磷和水下的白磷对比说明燃烧必须达到可燃物的着火点

D.图1和图2中水下白磷对比说明燃烧必须要有氧气

 

答案

D

解析:略

 

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