draft constant 中文意思是什麼
draft constant
解釋
吃水常數-
Based on some problems about random draft, energy conservation and ensemble efficiency of hydraulic - projects utilization, by the way of full - scale test, the application of frequency changer in agricultural water saving have been studied. it is the first time in china for the imagination that frequency changer has been used in tube - well irrigation in order to make the water pump keep constant transformation
本項目針對目前農業節水灌溉工程中存在的隨機取水、節能問題和水利工程資源的綜合利用效率提高問題，以實地工程應用試驗為基礎，對變頻調速裝置在農業節水灌溉工程中的應用進行了研究。
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