题目2单选题
公式∃x∃yA(x,y)∨∀y∀xB(x,y)∨(﹁P(x)∧Q(y))的对偶式是A. $x$yA(x,y)∨"y"xB(x,y)∨(﹁P(x)∧Q(y))B. "x"yA(x,y)∨$y$xB(x,y)∨(﹁P(x)∧Q(y))C. "x"yA(x,y)∧$y$xB(x,y)∧(P(x)∨Q(y))D. "x"yA(x,y)∧$y$xB(x,y)∧(﹁P(x)∨Q(y))