中文说明：2013美赛A题O奖论文（原版，免军费）
English Description：
2013 American Championship A and O prize papers (original edition, free of military expenses)
2013 American Championship A and O prize papers (original edition, free of military expenses)
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中文说明：2013美赛A题O奖论文（原版，免军费）
English Description：
2013 American Championship A and O prize papers (original edition, free of military expenses)23004_paper.pdf