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[单选题]
以下关于信息系统功能结构的叙述中，不正确的是（ ）。
A
信息系统包括信息的输入、处理和输出
B
信息系统需要支持整个组织在不同层次上的各种功能
C
信息系统的实现需要长期的努力
D
信息系统各功能之间基本没有信息联系
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试题答案：
D
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