题目内容
设全集U={x|x是小于10的正整数},A={1,2,3,4},B={4,5,6,7,8},则=
A.{9} | B.{1,2,3} |
C.{5,6,7,8} | D.{1,2,3,4,5,6,7,,8} |
A
略
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题目内容
A.{9} | B.{1,2,3} |
C.{5,6,7,8} | D.{1,2,3,4,5,6,7,,8} |