【单选题】【消耗次数:1】
设|A|=2, 则A上不同的反对称关系有 ( )个。
1
4
8
16
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相关题目
【简答题】 设 A = {1, 2=,2, 4=,3, 3=},B = {1, 3=,2, 4=,4, 2=},则对称差关系A⊕B等于:[填空1]
【单选题】 设|A|=3, 则A上不同的自反关系有 ( )个。
①  1
②  4
③  16
④  64
【单选题】 设 A = {1, 22, 43, 3},B = {1, 32, 44, 2},则对称差关系A⊕B等于:
①  {1,21,32,43,34,2
②  {2,4
③  {1,21,33,34,2
④  {1,23,3}.
【判断题】 若A={1,2,3},R={1,2},则R反对称。
①  正确
②  错误
【简答题】 设 A = {1, 2=,2, 4=,3, 3=},B = {1, 3=,2, 4=,4, 2=},则求差关系A-B。
【简答题】 设 A = {1, 2=,2, 4=,3, 3=},B = {1, 3=,2, 4=,4, 2=},则交关系A∩B等于:[填空1]
【判断题】 若A={1,2,3},R={2,2},则R是反对称的。
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]
【简答题】 设 A = {1, 2=,2, 4=,3, 3=},B = {1, 3=,2, 4=,4, 2=},则并关系A∪B的定义域dom(A∪B)等于:[填空1]
【单选题】 如果结构对称、荷载反对称,则轴力图、弯矩图反对称,剪力图对称,在对称轴上轴力、弯矩均为( )。
①  3
②  1
③  2
④  0
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①  正确
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①  whom
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①  open
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