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(一) 前言关于如何利用河渠中自由水流的能量的问题,自古以来,就引起人们的注意,一直到现在仍在继续研究中。早在三千多年以前,中国就已经采用了机械的方法来利用这种能量代替人力和畜力为人们服务。尽管利
(I) Preface The issue of how to use the energy of free water flow in canals has drawn attention since ancient times and continues to be studied until now. As early as three thousand years ago, China had adopted a mechanical approach to using this energy instead of manpower and animal power to serve people. Despite the benefits