2. 计算机
  3. if p、q and r are Boolean variables, which of the following formulas is (are) autological? ( ) Ⅰ. (┐P→q)→(p∨q) Ⅱ. (p

if p、q and r are Boolean variables, which of the following formulas is (are) autological? ( ) Ⅰ. (┐P→q)→(p∨q) Ⅱ. (p

admin2009-07-15  2
问题 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
选项 A、none
B、Ⅰ only
C、Ⅱ only
D、Ⅰ and Ⅱ
答案D
解析
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原NCRE全国计算机四级

NCRE全国计算机四级

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