【单选题】【消耗次数:1】
以下描述中,属于Win 7操作系统的特点是()。1)更易用 2)更快速 3)更简单 4)更安全
仅1)
仅 1)和2)
仅1)、2)和3)
全部
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①  正确
②  错误
【简答题】 设 A = {1, 2=,2, 4=,3, 3=},B = {1, 3=,2, 4=,4, 2=},则交关系A∩B的值域ran(A∩B)等于:[填空1]
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