题目内容

用真值表的方法判定下列判断的关系（1）只有甲在现场，乙才在现场。（2）如果甲没在现场，乙也没在现场。解：用p表示“甲在现场”，用q表示“乙在现场”由真值表可知，两个判断为等值关系。题目中两个判断应分别表示为（）

A. （1）p←q（2）﹁p→﹁q
B. （1）p←q（2）﹁p→q
C. （1）p←q（2）p→﹁q
D. （1）p→q（2）﹁p→﹁q

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