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现将充要条件的判定策略的几个主要方面,归纳举例说明如下: 1.利用定义直接判定 对于条件A和结论B: 如由A能推出B,则A就是B的充分条件。 如由B能推出A,则A就是B的必要条件。
Several major aspects of the decision criteria for sufficient and necessary conditions are summarized as follows: 1. Direct judgments using definitions For Condition A and Conclusion B: If A can be introduced by B, then A is a sufficient condition for B. If B can introduce A, then A is a necessary condition for B.