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下列说法错误的是( ) A.如果命题“¬p”与命题“p或q”都是真命题,那么命题...
下列说法错误的是( )
A.如果命题“¬p”与命题“p或q”都是真命题,那么命题q一定是真命题;
B.命题“若a=0,则ab=0”的否命题是:“若a≠0,则ab≠0”;
C.若命题p:∃x∈R,x
2-x+1<0,则¬p:∀x∈R,x
2-x+1≥0;
D.“
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”是“θ=30°”的充分不必要条件
考点分析:
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