【单选题】【消耗次数:1】
道路直交时,每个转角路口面积为( )。
0.216R2
0.2526R2
0.2346R2
0.2146R2
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相关题目
【单选题】 当道路斜交时,每个转角的路口面积为( )。
①  R2(sina/2-0.00873a)
②  R2(tana/2-0.00873)
③  R2(tana/2-0.00873a)
④  R2(cosa/2-0.00873a)
【单选题】 设f :R→R,f(x)=x2-2,g: R→R, g(x)=x+4,则gof为( )
①  满射
②  单射
③  双射
④  x2+2
【多选题】 设函数f: R′ R ? R ′ R, f()= (x+y)/2, (x-y)/2,则它是:
①  满射;
②  单射;
③  双射;
④  函数.
【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是对称的。
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是反对称的。
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
【简答题】 设 A={a,b,c,d}, A上的关系R1={,,},R2={,,,},求合成关系R1○R2。
【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】 But considering the long-standing business relationship between us, we shall ______ you a special discount.
①  grade
②  grasp
③  grant
④  glance
【单选题】 ______ the storm, we should have reached our company.
①  Because of
②  In spite of
③  In case of
④  But for
【单选题】 The rug is______ much better quality. It is made of 80% cotton and 20% wool.
①  from
②  of
③  in
④  at
【单选题】 How I wish every family______ a large house with a beautiful garden!
①  had had
②  will have
③  had
④  has
【单选题】 We all know first impression ______ a lot.
①  discounts
②  counts
③  amounts
④  mounts
【单选题】 And lastly, do you do anything else to ______ healthy?
①  stain
②  still
③  stay
④  stick
【单选题】 Weather______, we will go to the beach on Saturday.
①  permit
②  permits
③  permitting
④  permitted
【单选题】 ______, this book is not very difficult.
①  Generally say
②  Generally saying
③  Generally speak
④  Generally speaking
【单选题】 This ______,we all went home immediately.
①  did
②  done
③  does
④  do
【单选题】 Johnregretted_______tothemeetinglastweek.
①  not going
②  not to go
③  not having been going
④  not to be going