使用GI值能明显区分养分含量差异很小的不同种类牧草，这说明分级指数是评价牧草营养价值的最权威指标。
Differentiation of a variety of forage with minor nutrient discrepancy by using GI can indicate that GI is an authoritative index evaluating forage quality.
结合相对时间坐标系的概念，提出了一种改进的指数预测模型及其分级预测方法，并对双曲线模型进行了推广。
According to the concept of relative time coordinate system, a new exponent model and its grade predicting method are proposed.
本文提出的功效指数法建立了综合评价环境污染控制设施的分级标准。
The classification standard of comprehensive evaluation of environmental pollution control installations has been established by the efficacy index method that put forward in this article.
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