The mathematical model,the method for optimizing design,and the design princi-ple of hydraulic parameters are proposed to make head-flow curve flat.是什么意思_The mathematical model,the method for optimizing design,and the design princi-ple of hydraulic parameters are proposed to make head-flow curve flat.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句