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下列条目中，( )是数据仓库的基本特征。
Ⅰ、数据仓库是面向主题的
Ⅱ、数据仓库的数据是集成的
Ⅲ、数据仓库的数据是相对稳定的
Ⅳ、数据仓库的数据是反映历史变化的
D.都是

A.Ⅰ、Ⅱ和Ⅲ
B.Ⅰ、Ⅱ和Ⅳ
C.Ⅰ、Ⅲ和Ⅳ

【参考答案】

D
解析：数据仓库是面向主题的、集成的、相对稳定的、体现历史变化的数据集合。数据仓库的数据反映的是一段相当长时间......

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第一节单项填空从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。China has to feed a population over four times ______ though its area is only a little larger than the United States.A.largeB.so largeC.as largeD.more

A.A.large
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A.B.
【B1】
A.flied
B.landed
C.got

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