一个联言判断“﹁p∧q”为真，那么一定是（）
下列（）选项是推理有效的？
“唐朝总统是一个伟大的政治家”中的“唐朝总统 ”是（）
模态判断“□﹁p”与“◊p”（）
一个联言判断“﹁p∧q”为真，那么一定是（）
反证法先论证与原论题相矛盾的论断为假，然后得到原论题真，其所依据的是（）
题目
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联言判断真假的确定
联言判断为真，支判断都为真，所以﹁p和q都为真，即p为假，q为真。
多做几道
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