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earthen:就在LDE里。 -P I$SA, conic (2011-12-31 14:13) 66A}5b4)]
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fumm20:但就是不知到如何设置满足方程y2=4fx 的抛物面,急啊。各位献个策呀 (2011-12-31 15:01) 5%qq#;[n
phoenixzqy:呵呵呵,你上过高中就应当会的啊。将抛物面方程转化成半径r和conic的表达式,不就知道半径是多少了? (2011-12-31 19:54) TQ,KPf$0U
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