东倚子午岭，北靠羊圈山，西接六盘山，东、西、北三面隆起，中南部低缓，故有“盆地”之称。
Ziwuling East Hill, north mountain sheep pen, Liupanshan west, east, west, north uplift, central and southern low-, it is "basin" of.
此模型拟合性好，通过响应面分析以及岭嵴分析得到了优化组合条件。
The model was significantly fit well and the optimum combination was obtained by response surface analysis and ridge analysis.
结果趋势面分析往往存在共线性偏倚，利用岭回归趋势面分析可以在一定程度上控制共线性偏倚。
Results there is multi-collinearity bias in the result of the least square estimation trend-surface model, use the method of ridge regression can control the multi-collinearity bias.
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