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【单选题】
、$A,B,C$至少两个发生
A.
${(ABC)}\cup{(\bar{A}BC)}\cup{(A\bar{B}C)}\cup{(AB\bar{C})}$
B.
${(\bar{A}BC)}\cup{(A\bar{B}C)}\cup{(AB\bar{C})}$
C.
${A}\cup{B}\cup{C}$
D.
${(\bar{A}\bar{B}\bar{C})}\cup{(\bar{A}B\bar{C})}\cup{(\bar{A}\bar{B}C)}\cup{(A\bar{B}\bar{C})}$
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参考解析:
.
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