The economical benefit is notable under the circumstance of no increasing engineering and no risk according to analyzing and computing.
经分析计算，在不增加任何工程投入及承担任何风险的前提下，经济效益显著。
So making researches on the light aircraft flight control system is of theory, engineering and economical value.
研究小型飞机的飞行控制系统具有重要的理论意义、工程意义和经济意义。
The economical, social, and ecological benefits of biogas engineering would be improved greatly by the utilization of biogas residues on the production of safe food.
利用沼肥可替代部分化肥，生产无公害农产品，使沼气工程的经济效益、社会效益和生态效益大大提高。
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