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。

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Decisions could be made on the basis of price, delivery dates, after-sales service or any other variable.

决定可以基于价格、送货日期、售后服务或是任何其他可变因素而做出。

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The price variable, once perceived as the dominant aspect of the process, is now subordinate to the competition of the new product, the new business structure, and the new technology.

价格变量曾经被视为过程的主导因素，现在从属于新产品、新业务结构和新技术的竞争。

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They can elect a consistent speed at a higher price or variable speeds for a discounted rate.

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"Two major energy companies are currently offering cheap fix deals at the same price as the cheapest variable deals, cutting many people's bills by hundreds of pounds and guaranteeing no price rises for up to two winters, " he said.

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The price of corn is a critical variable in the world food equation, and food markets are on edge because U.S. corn stocks are plummeting due to the ethanol mandate.

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