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单项选择题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.

  • A

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