与元组关系演算公式(?x)(P(x)∨Q(x))等价的是()
A.(?x)(P(x)∧Q(x))
B.(┐?x)(┐P(x)∨┐Q(x))
C.(┐?x)(┐P(x)∧┐Q(x))
D.(?x)(┐P(x)∧┐Q(x))
正确答案是C
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