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利用右连接对栏目表和文章表进行查询P102
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【简答题】阅读理解。 Tom arrived at the bus station quite early for the London bus. The bus for London would not leave until five to twelve. He saw a lot of people waiting in the station. Some were standing in lines...
【简答题】设二次函数f（x）=x 2 +ax+5对于任意t都有f（t）=f（-4-t），且在闭区间[m，0]上有最大值5，最小值1，则m的取值范围是______．
【简答题】Tom arrived at the bus station quite early for the London bus. The bus for London would not eave until five to twelve. He saw a lot of people waiting in the station. Some were standing in lines, other...
【简答题】Tom arrived at the bus station quite early for the London bus. The bus for London would not leave until five to twelve. He saw a lot of people waiting in the station. Some were standing in lines, othe...
【单选题】设f （x）是奇函数，对任意的实数x、y，有f（x+y）=f（x）+f（y），当x＞0时，f （x）＜0，则f （x）在区间[a，b]上（ ）
A.
有最大值f（a）
B.
有最小值f（a）
C.
有最大值 f( a+b 2 )
D.
有最小值 f( a+b 2 )
【简答题】设a＞0，且a≠1，函数f（x）=log a x在区间[a，2a]上的最大值与最小值之和为3，则a=______．
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