排灌机械的选型配套,这个问题不但牵扯到设计,安装等一系列技术问题,而且还直接影响到经济效益的快或慢、得或失的问题。因为这里往往受主观因素与客观条件的制约。就主观因素讲,我们兴建水利设施配套排灌机具,总是希望提水能力越强,浇地越多,见效越快越好。但是这种主观愿望却 Irrigation and drainage machinery selection matching, this issue involves not only design, installation and a series of technical problems, but also directly affect the economic benefits of fast or slow, gains or losses. Because here is often subject to subjective factors and objective conditions. As far as subjective factors are concerned, we have to build irrigation and drainage facilities for water conservancy facilities. We always hope that the more water-carrying capacity and the more watering ground, the quicker the better. But this subjective desire is