spray irrigation system造句

• Design the spray irrigation system for forestry nursery
  林业苗圃喷灌系统设计
• Design of spray irrigation system for landscape
  浅谈园林绿化喷灌设计
• On planning design of spray irrigation system
  谈喷灌系统的规划设计
• Application on spray irrigation system in greenbelt lawn arid region yellow river valley
  黄河谷地干旱区绿地草坪喷灌系统的应用
• 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。