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设S={Φ,{1},{1,2}},则2^s有( )个元素。( )
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设S={Φ,{1},{1,2}},则2^s有( )个元素。( )
A、3;
B、6;
C、7;
D、8 。
时间：2021-09-01 17:03
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青书学堂
平顶山学院
计算机科学与技术
离散数学
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D
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