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通过逐步回归分析来得了75SiFe以及3种稀土孕育剂的孕育指标De、σb、BI、HB和σHB的衰退曲线，以75SiFe孕育剂为参照标准，对比分析了三种不同种类的稀土孕育剂的衰退特性及其原因。
The regression curves of De, σb, BI, HB and σHB of 75SiFe and three kinds of rare earth inoculants were obtained by stepwise regression analysis. Taking the 75SiFe inoculant as the reference standard, the decline of three different kinds of rare earth inoculants Features and causes.