According to the concept of relative time coordinate system, a new exponent model and its grade predicting method are proposed.
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.
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。
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