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A(72)isafilethatcontainsmetadata—thatis,dataaboutdata.

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A （72） is a file that contains metadata—that is,data about data.

A.document

B.Excel table

C. database

D.data dictionary

参考答案:

D数据字典是一个包含了元数据的文件，元数据是关于数据的数据。

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