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九年级化学上册第1章开启化学之门第3节怎样学习和研究化学旧知回顾：蜡烛燃烧过程中的变化素材沪教版.ppt

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九年级化学上册第1章开启化学之门第3节怎样学习和研究化学旧知回顾：蜡烛燃烧过程中的变化素材沪教版.ppt_第1页
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春蚕到死丝方尽， 蜡炬成灰泪始干。,你知道蜡烛在燃烧过程中都有哪些变化吗？,结束,

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