really? 2 is too little and three is too much. What is it?

来源: bearsback 于 2010-12-29 11:48:57 [] [博客] [旧帖] [给我悄悄话] 阅读数 : (16 bytes)
回答: 两本就够了。 由 戏雨飞鹰 于 2010-12-29 11:00:19

e=2.718...
haha

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