Using method of qualitative theory of ordinary differential equation, studies economic harvesting model with variable price and cost for a single population.
利用常微分方程定性理论的方法讨论了价格成本变化的单种群经济捕获模型。
In addition, this research has analyzed the influence of population statistic variable on each factor.
此外，本研究分析了人口统计变量对于各因素的影响。
The craftsmen's family and its population, the important variable of the family scale, needs further discussing, which is beneficial for a study of farmers' family scale.
工匠家庭和人口是当时家庭规模的一个重要变量，对其进行必要的讨论，对于研究农民家庭规模有一定裨益。
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