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政府网络的主要类型包括局域网、城域网、广域网、专网、内网、外网、政府网站、门户网站。()

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专家系统是一种侧重开发利用特定领域中的专家知识和经验的计算机程序，其内部包含有相当于某个领域专家水平的大量知识与经验，能够运用知识进行推理，解决与专家水平相当的咨询工作。()

电子政务建设就是政府按照经济社会发展和信息化的要求，加快政府管理的变革和流程的重组，并借助技术手段，达到为公众提供社会化综合服务的目的。()

传统政务与信息技术相加就是电子政务;将信息技术应用到政府中就是电子政务。()

Man depends on water for many things. He needs it for drinking. He needs it for growing food. He needs it for keeping himself clean and free from illness. He needs more and more water for industry. People often forget how necessary water is for industry. Imagine, for example, the immense quantities of water used by the great cooling towers of steel works. The demand for water is growing every day. It is closely connected with the increasing population and with the pressing problem of providing enough food. But the world has not yet found ways of storing enough water to satisfy all these important needs, not even in west countries like England. Great efforts are being made today to store water, particularly in hot countries where the rainfall is small.
Three-quarters of the world is covered with water. But only three percent of this water is fresh. All the rest is salt, and fills the oceans and the great inland seas. It is the salt that makes sea water useless to man. If you take the salt away the water can be used for drinking and for watering plants.
In 1962 President John Kennedy of the United States said, "When man discovers how to mm salt water into fresh water cheaply, he will have made a much more important scientific advance than when he first landed on the moon".
Human beings need water for【46】,【47】and【48】and【49】.
Main idea: The【50】