Based on product green design, this paper proposes the product recycling design economic analysis model to assure the equilibrium of costs and benefits at the recycling stage.

立足于产品的绿色设计，构建了产品再回收设计的经济性分析模型，以保证产品在回收处理阶段的成本与收益之间的均衡。

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P-T conditions and fluid nature in every metamorphic stage are found after study of fluid inclusions and calculating of thermodynamic equilibrium.

通过平衡热力学计算和流体包裹体研究获得了各变质阶段P - T条件和流体性质。

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Water requirements were measured by making use of water equilibrium, in the whole growing period and each growing stage to study the relations between millet yield and water requirement.

利用水分平衡法测定谷子全生育期的需水量及各生育阶段的需水量，从而探讨产量与需水量的关系。

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