论证形式无效的有()
A.(┐p→q),(r→┐s),(┐qVs)├p∨┐r
B.┐(p∧q),┐p├q
C.(┐p→q),(q→┐s),(┐s→r)├┐p→r
D.SIP├┐PES
E.SOP├POS
正确答案是BE
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