( √ ) 199、偶然误差(accidental error)也叫不可定误差(indeterminate error),是由不确定 原因引起、服从统计规律、具有抵偿性的误差。不可定误差的名称,意味着这种误差不可知和不 可克服。
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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.
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