highly significantp < 0.0001
(1) Regression analysis and significance experiment of the soil removal rate The results of the ANOVA for the soil removal rate Y 1 are shown in Table 6 , with a highly significant model fit ( p < 0.0001) and a lack of fit value of 0.7406 > 0.05, indicating that the lack of fit is not significant and the fitting accuracy is high.