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详述农业综合基础数据库的更新与维护的主要内容。

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简述遥感技术的优越性。

简述农业资源信息系统的组成。

农业信息系统的产生与形成有哪些重要的背景因素？

________he is honest and popular with his neighbors.
[A] As he is poor
[B] Poor as he is
[C] As poor he is
[D] As is he poor