题目内容

信息有一个信源及多个信宿，它体现的信息特征是（）

A. 抽象性
B. 层次性
C. 时效性
D. 共享性

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教育投资只有通过培养出来的劳动力以及再生产出来的科学技术进入生产领域，才能创造社会物质财富，说明教育投资具有（）

A. 周期性长特
B. 弹性大特点
C. 间接性特点
D. 长效性特点

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A. due to
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