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並前往https://community.adobe.com/t5/acrobat-discussions/how-to-set-a-calculated-field-to-null-if-reference-fields-are-also-null/td-p/10761168

How to set a calculated field to null if reference... - Adobe ...

a) What you want is a "blank" value, not a "Null" value. - I am not sure but this might help. When I open the PDF, the input fields doesn't ...

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