【单选题】【消耗次数：1】
所谓概念模型，指的是( )。
①
客观存在的事物及其相互联系
②
将信息世界中的信息数据化
③
实体模型在计算机中的数据化表示
④
现实世界到机器世界的一个中间层次，即信息世界
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