用欧拉图表示下列概念之间的关系
学校（A）；学生（B）；大学生（C）；共青团员（D）
用真值表来证明(p→q)←→(﹁q→﹁p)是永真式。
用真值表来证明﹁（p∧q）←→﹁p∨﹁q是永真式。
用欧拉图表示下列概念之间的关系
学校（A）；学生（B）；大学生（C）；共青团员（D）
已知所有的A为B，用欧拉图表示概念A与概念B之间可能有的外延关系。
用欧拉图表示下列概念之间的关系
工业（A）；农业（B）；农机工业（C）；农业机械（D）
题目
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真包含关系,交叉关系,全异关系
关于概念间关系的欧拉图是重要的考点之一。
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- （）AissueBpassedCdebateDanotherE otherF internationalGrelatedH influenceIsawJprofessorKnationalLcomfortable
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