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知识库通常是存储各类知识信息的地方，其中包括IPTV各种报错代码的查询等相关知识，而工单处理主要是处理工作单相关事务，资源查询侧重于资源信息的查找，资源修改是针对资源进行修改操作，并不用于查询IPTV报错代码，所以A选项正确。