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Which two statements correctly describe the relation between a data file and the logical database structures（）
A:An extent cannot spread across data files.
B:A segment cannot spread across data files.
C:A data file can belong to only one tablespace.
D:A data file can have only one segment created in it.
E:A data block can spread across multiple data files as it can consist of multiple operating system （OS）blocks

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出自：Oracle认证

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