问题：
[单选题]电子政务系统从国家一级到乡镇、街道等级各类政府机构的政务系统 ，形成纵向与横向联系；通过网络形成了条块交叉的结构，这是指的电子政务系统的______
A、概念结构
B、层次结构
C、功能结构
D、逻辑结构
参考答案：
B
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