还建立了基于最小二乘法曲线拟合与指数平滑法的需求量预测模型。
Additionally, a model of demand forecast, which bases on methods of least square and exponential smoothing, also be made.
结果表明：压力补偿式灌水器存在最优压力区间，在此区间内灌水器流态指数较小、水力特征曲线平滑；
The results show that pressure-compensating emitters have an optimal pressure range, in which the flow exponent is comparatively small and the water characteristic curve is smooth.
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