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Which three statements are true regarding the logical structure of the Oracle database？（）
A:Each segment contains one or more extents.
B:Multiple tablespaces can share single data file.
C:A data block is the smallest unit of I/O for data files.
D:It is possible to have tablespaces of different block sizes in a database.
E:Each data block in the database always corresponds to one OS block.

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出自：Oracle认证

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