【单选题】【消耗次数：1】
下列属于多媒体信息处理的关键技术的是?
①
数据校验技术
②
数据加密技术
③
数据交换技术
④
数据压缩技术
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基于内容检索要解决的关键技术是（）。（1）多媒体特征提取和匹配。（2）相似检索技术。（3）多媒体数据管理技术。（4）多媒体数据查询技术。
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