取非意思就是假如某个选项是错的。
大体有三种情况:
1. all----not all/some---none/always----not always/sometimes----never/everywhere---not everywhere/somewhere---nowhere/only one, exactly one---none, more than one/at least one, some---none
2.对于选项为条件句,将必要条件取非。
3。直接将谓语肯定变否定,或否定变肯定
2.对于选项为条件句,将必要条件取非。
能否解释一下,如果:A----B,那末A是B的充分条件,必要条件是哪个呢?
我的问题比较菜,刚开始学逻辑,见笑!
欢迎光临 ChaseDream (https://forum.chasedream.com/) | Powered by Discuz! X3.3 |