题型:问答题 简答题 设全集U={1,2,3,4,5,6,7},A={2,4,5,7},B={3,4,5},定义A*B={x∈U|x∈A或x∈B},则A*B等于 [ ]A.{1,6}B.{4,5}C.{1,2,3,6,7}D.{2,3,4,5,7} 查看答案