diffgeom01 定方向叫柱面的方向，定曲线叫准线, 是它的一条准线．这个柱面称为抛物柱面

来源: marketreflections 于 2011-12-11 17:13:25 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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