一个推理形式有效，当且仅当，具有此推理形式的任一推理都不会出现_____而结论假的情况。
所谓推理的有效性，指的是点击选择答案有效性。
- A.推理的结构
- B.推理的形式
所谓一个推理的形式是有效的，指的是对于一个推理形式假设其前提是正确的，则点击选择答案
- A.其结论一定也是真的
- B.其结果也一定是真的
所谓推理形式，指的是推理的点击选择答案和结论在形式上的联系方式。
- A.推断
- B.前提
反驳的目的是要_____
反驳有三种途径：反驳论题、反驳论据和反驳______
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推理的形式有效性及其判定
一个推理形式有效，当且仅当，具有此推理形式的任一推理都不会出现前提镇而结论假的情况。
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