多项选择题

You are creating a form that will access an Oracle8 database. On which three sources can you base a data block?（）

A.BFILE
B.REF column
C.Object table
D.Column object
E.INSTEAD-OF trigger

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单项选择题

A.REF cursor query.
B.Stored function.
C.From clause query.
D.Transactional trigger.

单项选择题

A.Blocks
B.Visual attributes.
C.Stacked canvas.
D.Nothing further needs to be created.