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一、前言人们对水的看法已进入新的时代。过去都认为它是“取之不尽,用之不竭”可以按人们的需求,无节制地开采和使用的廉价品,根本没有认识到它是国民经济发展的重要资源,从而导致不少地方已发生水源危机,制约着工农业进一步地发展和人民生活水平的提高。据水电部调查,1979年全国有154个城市发生“水荒”,日缺水量800多万
I. Introduction People’s perception of water has entered a new era. It used to be regarded as “inexhaustible” cheap goods that can be exploited and used uncontrolled according to people’s needs. It has never realized that it is an important resource for the development of the national economy and has led to many places The water crisis has taken place, restricting the further development of industry and agriculture and raising the standard of living of the people. According to the survey conducted by the Ministry of Electricity and Water, in 1979, 154 cities nationwide experienced “water shortages” and more than 8 million daily water shortages