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下列各式:①1∈{0,1,2};②∅⊆{0,1,2};③{1}∈{0,1,2004};④{0,1,2}⊆{0,1,2};⑤{0,1,2}={2,0,1},其中错误的个数是( ) A.1个 B.2个 C...

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