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一、问题的提出与系统的描述 (一)问题的提出水是人们生活与工农业生产所必需的一种有限的资源。由于人口的不断增长,工农业的不断发展,为工农业提供适当的清洁的水,为人民生活提供廉价的质量合格的饮用水,已成为世界许多地区的技术、经济和政治的重大课题。由于电子计算机的应用,使这一课题数值计算的精确度大大提高了。但是,目前其计算
First, the question raised and the system description (A) the question raised Water is a limited human resources and industrial and agricultural production necessary limited resources. Due to the continuous population growth, continuous development of agriculture and industry, providing appropriate clean water for industry and agriculture and providing cheap and quality drinking water for people’s livelihood have become major technical, economic and political issues in many parts of the world. Due to the application of electronic computers, the numerical calculation accuracy of this subject has been greatly improved. However, it is currently calculated