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You create a data block based on a relation table containing a REF column. You select the REF column for your form module. Which statement about the REF column is true?（）
A:It is created as a nondisplay item. 
B:The Lock Record property is set to Yes. 
C:It cannot be referenced in item level triggers. 
D:It is placed on the canvas with the highest sequence number.

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出自：Oracle认证

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