下列命题之中,U为全集时,不正确的是( ) A.若A∩B=空集 (CuA)∪(CuB)=U

B、若A∩B=空集,则A=空集或B=空集C、若A∪B=U,则(CuA)∩(CuB)=空集D、若A∪B=空集,则A=B=空集... B、若A∩B=空集,则A=空集或B=空集
C、若A∪B=U,则(CuA)∩(CuB)=空集
D、若A∪B=空集,则A=B=空集
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B、例如U=自然数集,A={1},B={2},A∩B=空集
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两人醉酒 A同B发生口角,A拽住B方衣领将B推到,倒地后B迟迟不起,就医后B不治死亡请问A属于过失伤人还是故意伤人。现在A被拘留,公安局定的罪是故事伤致死罪,不知道这种情况可不可以翻案成意外伤人罪?公安局正在做资料应该还没送到检察院。事候A发现B迟迟不起自己拨打的110,B送医院几天后死亡,请问属于自首吗?A在量刑上能从宽吗?谢谢大家,老师的帮忙。
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A:肯定对,把全集看作是自然数集,A为{1}B为{2}则A∩B为空集,CuA=除1外所有自然数,CuB=除2外所有自然数。所以CuA∪CuB=U(也就是全体自然数)
B:只要举出一个反例则可以被推翻。例:A为{1}B为{2}A、B都不为空集。且A、B交集为空集。所以B错
C:韦恩图法,把图分成两部分,一边为A 一边为B ,A∪B=U,且满足后面的条件。即C对,当然画法不止一种。
D:就不用说了。
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B
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