任何机械加工所得的表面，实际上不可能是理想的光滑表面，总是存在一定的微观几何形状误差。
It is impossible that the surface gained by any machining is perfectly slippery. There is some microcosmic error of geometrical shape on the surface.
由于数据资料的限制以及模型的不完善性，计算结果不可避免的会产生误差，但在对于地区政策的制定，仍然具有一定的参考价值。
Due to limit of data and the imperfect model, there are errors in the result inevitably. But on the whole, this research has some application value about establishing regional policy.
由于数据资料的限制以及模型的不完善性，计算结果不可避免的会产生误差，但在对于地区政策的制定，仍然具有一定的参考价值。
Due to limit of data and the imperfect model, there are errors in the result inevitably. But on the whole, this research has some application value about establishing regional policy.
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