问题
单项选择题
if p、q and r are Boolean variables, which of the following formulas is (are) autological ( ) Ⅰ. (┐P→q)→(p∨q) Ⅱ. (p→r)∧(┐p→q) ∧┐r
A．none
B．Ⅰ only
C．Ⅱ only
D．Ⅰ and Ⅱ
答案
参考答案：D
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if p、q and r are Boolean variables, which of the following formulas is (are) autological ( ) Ⅰ. (┐P→q)→(p∨q) Ⅱ. (p→r)∧(┐p→q) ∧┐r
A．none
B．Ⅰ only
C．Ⅱ only
D．Ⅰ and Ⅱ
参考答案：D