关于发明创造的事作文3篇（300字400字500字）

作文网友 *发表于 2011-5-22 18:17:00* · 发表于 2011-5-22 18:17:00

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作文网友 *发表于 2011-6-7 18:14:00* · 发表于 2011-6-7 18:14:00

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作文网友 *发表于 2011-6-22 21:58:00* · 发表于 2011-6-22 21:58:00

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作文网友 *发表于 2011-10-4 21:12:54* · 发表于 2011-10-4 21:12:54

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作文网友 *发表于 2011-12-18 15:34:45* · 发表于 2011-12-18 15:34:45

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作文网友 *发表于 2011-12-21 12:12:13* · 发表于 2011-12-21 12:12:13

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