单项选择题

What is the data type returned by the CREATE_TIMER built-in?（）

A.long
B.timer
C.number
D.varchar2

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多项选择题

A.methods
B.object tables
C.object columns
D.collection types
E.object as stored procedure parameters

多项选择题

A.vector
B.database view
C.database table
D.transactional trigger
E.PL/SQL table of records
F.multi-dimensional array