fixed spray meaning in Chinese

固定水流

The necessary motion spray irrigation powered vehicle composition migration or half fixed spray irrigation unit , use each kind of water source ( well , ditch , river , pond , lake , pond ) carry on the spray irrigation to the size land parcel
配套移动喷灌动力车，组成移动或半固定喷灌机组，利用各种水源（井、渠、河、池、湖、溏）对大小地块进行喷灌。
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。