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【单选题】
满足条件{1，2，3} M {1，2，3，4，5，6}的集合M的个数是 [ ]A.
8
B.
7
C.
6
D.
5
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皮皮学刷刷变学霸
举一反三
【单选题】The people were willing to give the money to the young man because ______.
A.
they felt great sympathy for him
B.
they were entertained by him
C.
he always played on the trumpet
D.
they wanted to help him
【单选题】下面关于聚集索引和非聚集索引说法正确的是( )
A.
每个表只能建立一个非聚集索引
B.
非聚集索引需要较多的硬盘空间和内存
C.
一张表上不能同时建立聚集和非聚集索引
D.
一个复合索引只能是聚集索引
【单选题】When ____ about the source of his income, he hesitated for a moment, obviously not willing to give us a direct answer. [ ]
A.
asked
B.
asking
C.
being asked
D.
having asked
【简答题】什么是产品组合?产品组合的宽度,长度,深度和关联性各指什么?分析产品组合一般应考虑哪些因素?
【简答题】giving or willing to give freely
【单选题】The Government is going to give new 'job splitting', grants to employers willing to offer part time work to people claiming unemployment benefit. The next scheme, which took many union leaders and lar...
A.
Y
B.
N
C.
NG
【多选题】下面关于聚集索引和非聚集索引的说法正确的是:
A.
聚集索引改变数据表中记录的物理存储顺序,使之与索引列的顺序完全相同。
B.
非聚集索引不改变数据表中记录的存放顺序,只是将索引建立在索引页上。
C.
聚集索引查询时先从索引页上获取记录位置,再找到所需要的记录内容。
D.
非聚集索引查询时先从索引页上获取记录位置,再找到所需要的记录内容。
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