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【单选题】
对多种影响因素按其重要程度进行一定组合,先按第一组合选择出较大范围目标对象,再按第二组合对第一组合筛选出来的对象进一步缩小范围,以此类推,得出最终目标对象。该描述是以下哪种数据分析方法的思想()。A.
回归分析法
B.
平均分析法
C.
对比分析法
D.
层层筛选法
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反馈参考答案：
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?
【单选题】What does 'You cannot give him too much money' mean?
A.
You shouldn't give him too much money.
B.
The more money you give him, the better.
C.
You can't give him a lot of money.
D.
You ought to give him less money.
【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。
【单选题】Busy and successful as he was, the novelist was willing to _____ any promising young man and give him all the help he could.
A.
take up
B.
pick up
C.
make up
D.
look up
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