当前位置：在线题库搜索＞[单选题]（）指为数据仓库提供最底层数据的运作数据库系统及外部数据。的答案是什么？
问题：
[单选题]（）指为数据仓库提供最底层数据的运作数据库系统及外部数据。
A、数据源
B、监视器
C、集成器
D、客户应用
参考答案：
A
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