To improve synthesis benefit, an applied system of optimal and economical operation of distribution network was designed. It considered the cost of practice run and operation.
结合配电网的实际运行和操作费用，为提高综合效益，设计了实用的配电网络优化经济运行系统。
Then, both optimal and rational renewal cycle under different conditions were analyzed from the viewpoint of optimizing the economical benefit of the tractors owners.
并对此方法从拖拉机所有者追求经济利益的角度，确定了大修制拖拉机最佳更新期与合理更新期的经济界限。
Two mathematical models of economic benefit change were simulated. As a result of technical economical analysis, the optimal economic life-span was found to be about 33 years old.
从资金利用和土地利用两个方面模拟出槾桔生产经济效益变化的数学模型，经过技术经济分析，找出槾桔树的最佳经济寿命为树龄33年左右。
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