已知全集 U = {1,2,3,4}, 集合 A = {1,3}, 则 ( )
A.{1,3} | B.{2,4} | C.{1,2} | D.{3,4} |
更新时间:2020-01-11 21:08:35
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A.{1,3} | B.{2,4} | C.{1,2} | D.{3,4} |