Machining error is a very complex non-linear problem.
机械加工误差是非常复杂的非线性问题。
Linear error curve can be concave curve, it could be a convex curve.
线性误差曲线可以是凹形曲线，也可以是凸形曲线。
Methods Studied factors that affected the occupational stress of doctors in a hospital by means of linear measurement error model.
方法利用线性测量误差模型对某医院医务人员职业紧张的影响因素进行分析。
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