.qsf
文件类型：Qualtrics Survey File
扩展名为.qsf的文件是一个备份文件。文件说明：
Data file exported by Qualtrics online survey software; formatted in XML and is generated when the Export Survey option is selected; can be used as a backup file and may be imported into the survey system for later use.Qualtrics Survey Solutions can be accessed online at Qualtrics.com..qsf
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