The single parabolic curve describing the distribution of soil moisture storage capacity is substituted by double parabolic curve to promote the widely used Xinanjiang model for runoff calculation.
提出了双抛物线型土壤蓄水容量关系曲线，对新安江模型产流计算公式进行了改进。
The outspread principle of involute and enveloping principle of curve is applied to build the model of double involutes gear contrate profile, the veracity is verified by the data.
运用渐开线展开和曲线包络原理，建立了双渐开线齿轮端面齿廓数学模型，用数据验证了模型的准确性。
The outspread principle of involute and enveloping principle of curve is applied to build the model of double involutes gear contrate profile, the veracity is verified by the data.
运用渐开线展开和曲线包络原理，建立了双渐开线齿轮端面齿廓数学模型，用数据验证了模型的准确性。
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