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【简答题】
已知函数 （1）当 时，求函数 的极值； （2）若函数 在定义域内为增函数，求实数m的取值范围; （3）若 ， 的三个顶点 在函数 的图象上，且 ， 、 、 分别为 的内角A、B、C所对的边。求证：
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出疹前9天至出疹后5天
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【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.
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【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)
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(1,2,4,6,8)
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【单选题】麻疹患儿具有传染性的时段是
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出疹前5天至出疹后5天
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出疹前5天至出疹后10天
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【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.
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【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)
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【单选题】Suppose relation R(A,B) has the following tuples: A B 1 a 7 t 2 g 4 c 9 t and relation S(B,C,D) has the following tuples: B C D c 5 6 a 7 8 t 8 9 Compute the theta-join of R and S with the condition R...
A.
(1, a, a, 7, 8)
B.
(2, g, c, 5, 6)
C.
(4, c, c, 7, 8)
D.
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【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?
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(4,3)
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相关题目：
【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.
企业利润
B.
消费者需要
C.
所有者利益
D.
社会利益
查看完整题目与答案
【多选题】精油取样所用的工具包括搅拌器、抽油器 ( ) 、活栓、泵、虹吸管、玻璃取样管和容器。
A.
底部取样器
B.
表层取样器
C.
中心取样器
D.
区层取样器
查看完整题目与答案
【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
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【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)
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(1,2,3)
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【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...
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(3,4,4,6,8)
B.
(1,2,2,6,8)
C.
(5,6,4,6,8)
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(1,2,4,6,8)
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【单选题】麻疹患儿具有传染性的时段是
A.
出疹前5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.
出疹期
查看完整题目与答案
【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)
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【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)
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(4,5,6)
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【单选题】Suppose relation R(A,B) has the following tuples: A B 1 a 7 t 2 g 4 c 9 t and relation S(B,C,D) has the following tuples: B C D c 5 6 a 7 8 t 8 9 Compute the theta-join of R and S with the condition R...
A.
(1, a, a, 7, 8)
B.
(2, g, c, 5, 6)
C.
(4, c, c, 7, 8)
D.
(4, c, c, 7, 8)
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【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?
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