One of the difficulties when integrating multiple source systems is:对于集成多个原始系统的困难点在于::()?
（A）Maintaining documentation describing the data warehouse operation.维护数据仓库操作描述文档
（B）Having a data quality rule applicable to all source systems.指望一个数据质量规则适用于所有原始系统
（C）Modifying the source systems to align to the enterprise data model.修改源系统使其和企业数据模型保持一致
（D）Completing the data architecture on time for the first release.第一次发布时要准时完成数据架构
（E）Determining valid links or equivalences between data elements.确定数据元素之间有效链接或等效性 答案解析: 该题直接考定义及概念，， 这里指的数据元素，是指表的字段这里指的等效性，是内容一样，但叫法不一样的字段和内容，如有的叫会员表(member)，有的叫customer(客户表)
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