经济理论上的最优再保险就是在不同的优化准则下，寻找最优再保险合同。
The reinsurance is to find optimal contact under the different criterion in the economical theorem.
发射总重量的评价准则综合考虑了系统质量和阻力面积，能够全面反映系统的经济性能，可以得到很好的优化结果。
The results indicated that total launched weight is a effective assessing criterion which can combine both system mass and resistance area into a unified criterion.
提出了基于可靠性与经济优化相结合的在役混凝土结构剩余使用寿命的评估准则，并建立了在役混凝土结构剩余使用寿命预测的优化模型。
In this paper, an assessment criterion for remaining service life of existing concrete structures is put forward based on theory of reliability and economic optimization.
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