设集合P={1,2,3,4},Q={3,4,5,6},则P∪Q=( ) A.? B.{3,4} C.{1,2,5,6} D.{1
设集合P={1,2,3,4},Q={3,4,5,6},则P∪Q=()A.?B.{3,4}C.{1,2,5,6}D.{1,2,3,4,5,6}...
设集合P={1,2,3,4},Q={3,4,5,6},则P∪Q=( ) A.? B.{3,4} C.{1,2,5,6} D.{1,2,3,4,5,6}
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