The machining experiment is made on semi-spherical part by orthogonal test method. The results of test are analyzed by variance analysis.
运用正交试验方法对半球形零件进行切削试验，采用方差分析法分析试验结果。
2
The results showed that the soil nutrient had semi-variance structure in bamboo forest, and most of them were spherical model.
结果表明，毛竹林土壤养分存在半方差结构，多数为球状模型。
3
Results showed that the variance curves of the groundwater salt content in the years 1998 and 1999 display a spherical model, while the curves in 1997 and 2000 exhibit a linear model.