...行性标准(Criterion for Feasibility ) 纯经济效益> 0 或经济效率> 1 （二）经济效益择优标准(Criterion for Optimization ) 技术方案经济效益优化，就是要从多个可行方案中，选择一个或一组技术方案，使其经济效益达到最大化或满意化。
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To establish optimized-instruction criterion rationally is of great importance for the optimization of teaching theory and practice.
合理确定优化教学的标准，是优化教学理论和实践的重要问题。
Therefore, the space fluctuation parameters proposed in present paper provides a quantitive criterion for configuration optimization design for slotted fin surfaces.
因此，本文提出的无量纲空间波动参数为开缝翅片结构优化设计提供了一个定量的标准。
Based on fully stressed criterion, a mathematical model for spring optimization design has been built. The model is a constrained nonlinear programming problem.
按满应力准则建立了弹簧优化设计的数学模型，它是一个有约束的非线性规划问题。
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