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4Â¥2014-09-19 17:38:10
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4Â¥: Originally posted by jiagle at 2014-09-19 17:38:10
µ¥¶ÀÓëÑõÆø£º4Al + 3O2 = 2Al2O3
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7Â¥: Originally posted by founder at 2014-09-22 16:02:52
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