has an optimum value 存在一个最佳值
There existed an optimum value (0.8-0.9) for reburn zone stoichiometric coefficient.
再燃区过量空气系数存在一个最佳值（0．8～0．9）；
There is an optimum value about the concentration of a high molecular weight polymer.
高分子质量浓度存在一个最佳值。
The result shows that the anti_wear performance is increased significantly and the amount of addition has an optimum value.
四球机试验结果表明含氮硼酸酯添加到基础油中，能显著提高其抗磨性能，且添加量存在一个最佳值。
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