设全集U={1,2,3,4,5,6,7,},A={x|1≤x≤6,x∈N * },则∁ U A=( ) A.∅ B.{
1个回答
∵A={x|1≤x≤6,x∈N
*
}={1,2,3,4,5,6}.
U={1,2,3,4,5,6,7},
故C
U
A={7}
故选B.
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