1 . 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∁U(A∪B)=( )
A.{9} | B.{1,2,3} |
C.{5,6,7,8} | D.{1,2,3,4,5,6,7,8} |
您最近一年使用:0次
A.{9} | B.{1,2,3} |
C.{5,6,7,8} | D.{1,2,3,4,5,6,7,8} |