npdes meaning in Chinese

国家污水排放控制系统

To improve computing precision , the latter applies interpolating function of curved - quadrilateral element containing six npdes to thicking the influence surface of grillage . compared with lagrangian interpolation for rectangular element and triangle plane interpolation , this way not only improves computing precision but be more suitable for the curved - bar grillage analyzing method introduced this paper
为了提高计算精度，本文应用六结点曲边四边形单元插值函数加密梁格影响面，与矩形单元拉格朗日插值及三角平面插值方法相比，不但提高了计算精度，且更适于曲杆梁格分析。