在单一要素变动的情况下，边际价值成本应当等于边际价值收益。
In case of changing the single factor, the cost of marginal value should equal to its marginal profit.
在生产函数的基础上，本文推导出在劳动要素充分供给的假设下，我国实际煤炭产业边际成本函数的变化趋势。
In the production function, the paper derived China's actual trend of the marginal cost function under the assumption that there is adequate supply of labor in the coal industry.
高科技企业科技要素投入的边际递增性和边际成本趋于零；
The margin income and margin cost of technology element are zero;
对边际机会成本深入分析，建立再生水资源的边际机会成本模型，阐述其各要素内涵；
Through the MOC (marginal opportunity cost) analyzed, model of reclaimed wastewater has been given, and expatiate the meaning of the parts of this model;
对边际机会成本深入分析，建立再生水资源的边际机会成本模型，阐述其各要素内涵；
Through the MOC (marginal opportunity cost) analyzed, model of reclaimed wastewater has been given, and expatiate the meaning of the parts of this model;
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