【判断题】【消耗次数:1】
若A={1,2,3},R={2,2},则R是对称的。
正确
错误
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相关题目
【判断题】 若A={1,2,3},R={2,2},则R是反对称的。
①  正确
②  错误
【判断题】 若A={1,2,3},R={2,2},则R是传递的。
①  正确
②  错误
【判断题】 若A={1,2,3},R={2,2},则R是自反的。
①  正确
②  错误
【判断题】 若A={1,2,3},R={2,2},则R是反自反的。
①  正确
②  错误
【判断题】 若A={1,2,3},R={1,2},则R反对称。
①  正确
②  错误
【判断题】 若A={1,2,3},R={1,2},则R反自反。
①  正确
②  错误
【判断题】 若A={1,2,3},R={1,2},则R不具有传递性。
①  正确
②  错误
【单选题】 设集合A={1,2,3},下列关系R中不是等价关系的是(   )
①  R={1,12,23,3}
②  R={1,12,23,33,22,3}
③  R={1,12,23,31,2}
④  R={1,12,23,31,22,11,33,12,33,2}
【单选题】 设 R={0,10,20,31,21,32,3},则{1,2}在关系R下的像R[{1,2}]等于:
①  {0,20,31,3
②  {1,02,03,02,13,13,2
③  {0,10,20,31,21,3
④  {2,3}.
【判断题】 调度r1(A); r2(A); r3(B); w1(A); r2(C); r2(B); w2(B); w1(C);是冲突可串行化的。
①  正确
②  错误
随机题目
【单选题】 17. If you _____ to me, you wouldn’t be in such trouble now.
①  listened
②  will listen
③  had listened
④  listen
【单选题】 23.They have considered their high standard of living a(n)____for practising their basic beliefs.
①  award
②  reward
③  result
④  consequence
【单选题】 21. If only I _____ the answer to your question.
①  knew
②  will know
③  know
④  can know
【单选题】 9. He must have got into your room ______ at night.
①  somewhat
②  somehow
③  however
④  whatever
【单选题】 19.It’s time he_____ a good rest.
①  has
②  will have
③  had
④  must have
【单选题】 4.After getting ____ in classroom activities, the student managed to overcome his shyness.
①  interested
②  bored
③  involved
④  to know
【单选题】 19._____ all this work and so little sleep at night, I don’t think I can go on much longer.
①  What about
②  What if
③  What with
④  What for
【单选题】 14. I’m confident that you are _______a good job at your new position.
①  able of doing
②  capable of doing
③  capable to do
④  able at doing
【单选题】 8.______ your request for a make-up test, we have referred the matter to the school authority.
①  For the purpose of
②  With regard to
③  In view of
④  In accordance with
【单选题】 16. _____ money, they are rich.
①  In terms of
②  About
③  Because of
④  By way of