- permanent sprinkler system
- solid sprinkler system
下载手机词典可随时随地查词查翻译
固定式喷灌系统的英文
例句与用法
- Irrigation techniques - solid set sprinkler systems - test methods
灌溉技术.固定式喷灌系统.试验方法 - Irrigation techniques - solid set sprinkler systems - part 2 : test methods
灌溉技术.固定式喷灌系统.第2部分:试验方法 - Based on the analyses of the investment of nozzle tube net and relationship between the annual operation cost and tube diameter function of a fixed spray irrigation system , a mathematic model to calculate the economical tube diameter of a spray irrigation system is developed by using the minimum expense norm and nonlinear planning theory in engineering economic analysis , and a direct calculation formula for the economical tube diameter in unrestrained conditions is presented
摘要在分析了固定式喷灌系统的管网投资、年运行费用与管径函数关系的基础上，利用工程经济分析中费用最小化准则和非线性规划理论，建立了求解喷灌系统管网经济管径的数学模型，并给出了无约束条件直接求解经济管径的计算式。