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【单选题】
Today it is his turn to__________the children from school.A.
pick
B.
pull
C.
catch
D.
collect
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举一反三
【多选题】社会营销观念要求市场营销者在制定市场营销政策时要统筹兼顾()。
A.
整车为自交付第一个车主起，至汽车制造商明示的安全使用期止；
B.
汽车制造商未明示安全使用期的，或明示安全使用期不满10年的，自销售商将汽车产品交付第一个车主之日起10年
C.
汽车轮胎的召回期限为自交付第一个车主起8年；
D.
对于汽车产品安全性零部件的易损件，明示的使用期限为起召回时限。
【单选题】麻疹患儿具有传染性的时段是
A.
出疹前9天至出疹后5天
B.
出疹前5天至出疹后10天
C.
出疹前10天至出疹后5天
D.
出疹前10天至出疹后10天
E.
出疹前3天至出疹后10天
【单选题】Suppose relation R(A,B,C) has the following tuples: A B C 1 2 3 4 2 3 4 5 6 2 5 3 1 2 6 Select the tuples with the condition of either A>B or B>C. Which of the following tuples is in the result?
A.
(4,5,3)
B.
(2,5,3)
C.
(4,5,6)
D.
(1,2,3)
【单选题】Suppose relation R(A,B) has the following tuples: A B 1 2 3 4 5 6 and relation S(B,C,D) has the following tuples: B C D 2 4 6 4 6 8 4 7 9 Compute the theta-join of R and S with the condition R.A < S.D...
A.
(3,4,4,6,8)
B.
(1,2,2,6,8)
C.
(5,6,4,6,8)
D.
(1,2,4,6,8)
【单选题】Suppose relation R(A,B,C) has the following tuples: A B C 1 2 3 4 2 3 4 5 6 2 5 3 1 2 6 Compute the projection π C,B (R). Which of the following tuples is in the result?
A.
(2,3)
B.
(4,3)
C.
(3,2)
D.
(5,6)
【单选题】Suppose relation R(A,B,C) has the following tuples: A B C 1 2 3 4 2 3 4 5 6 2 5 3 2 1 6 Select the tuples with the condition of either A>B or B>C. Which of the following tuples is NOT in the result?
A.
(4,2,3)
B.
(2,5,3)
C.
(4,5,6)
D.
(2,1,6)
【单选题】Suppose relation R(A,B,C) has the following tuples: A B C 1 2 3 4 2 3 4 5 6 2 5 3 1 2 6 Compute the projection π C,A (R). Which of the following tuples is in the result?
A.
(1,3)
B.
(4,3)
C.
(3,4)
D.
(5,3)
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