解释一下充分必要条件：猫和四条腿就是充要条件，正常的猫一定有四条腿，但有四条腿的不一定是猫

来源: 上海大男人于 2025-02-15 07:33:58 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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