某同学在做“对蜡烛及其燃烧的探究 实验时观察到燃着的蜡烛熄灭时会产生白烟.提出问题蜡烛刚熄灭时总会有一缕白烟冒出它的成分是什么� Template




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tomski某同学在做“对蜡烛及其燃烧的探究 实验时观察到燃着的蜡烛熄灭时会产生白烟.提出问题蜡烛刚熄灭时总会有一缕白烟冒出它的成分是什么� coloring