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多选题
Top N analysis requires （） and （）.
A
the use of rowid
B
a GROUP BY clause
C
an ORDER BY clause
D
only an inline view
E
an inline view and an outer query
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单选题若一个栈以向量V[1..n]存储，初始栈顶指针top设为n+1，则元素x进栈的正确操作是（）。A
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单选题判定一个顺序栈S（栈空间大小为n）为空的条件是（）。A
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