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Which three statements are true about logical structures of the Oracle database（）
A:Each segment contains one or more extents.
B:Multiple tablespaces can share a single data file.
C:A data block is the smallest unit of input/output （I/O） in 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 operating system block.

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出自：Oracle认证

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