题目内容（请给出正确答案）

[主观题]

Which two statements about sequences are true？（）

A. You use a NEXTVAL pseudo column to look at the next possible value that would be generated from a sequence, without actually retrieving the value.

B. You use a CURRVAL pseudo column to look at the current value just generated from a sequence, without affecting the further values to be generated from the sequence.

C. You use a NEXTVAL pseudo column to obtain the next possible value from a sequence by actually retrieving the value from the sequence.

D. You use a CURRVAL pseudo column to generate a value from a sequence that would be used for a specified database column.

E. If a sequence starting from a value 100 and incremented by 1 is used by more then one application, then all of these applications could have a value of 105 assigned to their column whose value is being generated by the sequence.

F. You use REUSE clause when creating a sequence to restart the sequence once it generates the maximum value defined for the sequence.

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