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多选题
Which 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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