他的邏輯很正確。
回答: 樓主怎麽把“充要條件”此用錯了呢?你要說什麽呢?他說這是必要條件,不是充要條件。也就是說,這隻是必要條件,不是充分條件。t啊的邏
由 nightrider
於 2014-11-28 22:10:08
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