Optimal concentration of 0.15%, the best application method is spraying.

最佳使用浓度为0.15%，最佳施用方法为叶面喷施。

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Methods MTT technique was used to observe the optimal concentration and action time.

方法MTT法观察腺苷的最佳作用浓度及最佳作用时间。

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This paper discusses the function, effect, optimal concentration, its effect on floatation and selection of wetting agent for coal seam infusion.

本文对煤层注水添加湿润剂的作用、效果、最佳浓度、对浮选的影响及湿润剂选择等问题进行了探讨，得出了相应的结论。

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Economists argue about the disincentive effects of higher tax rates. (Messrs Piketty and Saez, the economists who have transformed analysis of income concentration at the top, reckon, controversially, that the optimal top income-tax rate could be as high as 80%.) But no one doubts that there are trade-offs.

ECONOMIST: Policy prescriptions