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4、“电子备份投标文件”是指与“电子加密投标文件”同时生成的数据电文形式的投标文件。供应商在电子交易平台上传“电子加密投标文件”后,还可以邮寄或送达的方式在投 标截止时间前提交以介质(U 盘)存储的“电子备份投标文件”。“电子备份投标文件”应当密封包装并在包装上标注采购项目编号、项目名称、投标单位名称等并加盖公章。