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【单选题】
下列的选项中讨论的是数据仓库的数据基本特征是 Ⅰ．数据仓库是面向主题的 ．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．数据仓库数据是反映历史变化的A.
Ⅰ和Ⅱ
B.
Ⅰ，Ⅱ和Ⅲ
C.
Ⅱ，Ⅲ和Ⅳ
D.
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A.
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B.
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C.
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D.
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