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沙发#
发布于：2013-01-08 09:49
炭在氧气中燃烧产生明亮的火焰，C+O2===CO2
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地板#
发布于：2013-01-09 16:07
回复 #3 zrzr589 的帖子
同学你好！前几期可以在这里找O(∩_∩)O哈！
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5楼#
发布于：2013-01-10 18:41
 好棒啊~~~ |
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6楼#
发布于：2013-01-11 22:08
xfxcvxcx
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