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多选题
Which two statements correctly describe the relation between a data file and the logical databasestructures（）
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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