题目内容
A.{1} B.{1,2} C.{2} D.{0,1,2}
解析:由补集、并集定义容易推出D正确.
答案:D.
A.{1} B.{1,2}
C.{2} D.{0,1,2}
A.{1} B.{1,2} C.{2} D.{0,1,2}
A.{1}
B.{1,2}
C.{2}
D.{0,1,2}