他的逻辑很正确。
回答: 楼主怎么把“充要条件”此用错了呢?你要说什么呢?他说这是必要条件,不是充要条件。也就是说,这只是必要条件,不是充分条件。t啊的逻
由 nightrider
于 2014-11-28 22:10:08
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