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Based on the principle of energy - economics, an equation for calculating the annual total expenses was proposed.
从火用经济学的原理出发, 得到了保温管道整体费用方程及确定最佳管径和保温层厚度的计算公式.
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Construction costs refer to the total expenses of varied activities in the construction process.
施工成本是项目施工过程中各种耗费的总和.
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