高强度螺栓广泛地应用于工程领域，扭矩系数是评定其性能级别的重要参数。
High strength bolts are widely applied in engineering practice. The torque coefficient is important evaluation parameter of their performance class.
如何定量描述碳化物的不均性，如何客观地评定其级别，这是一个亟待解决的实际问题。
How to describe the unevenness of carbide quantitatively and grade it are objectively actual problems that we have to solve.
自由曲线的轮廓常用离散点来表示，而不是已知的数学方程，评定其轮廓度误差非常困难。
The profile of the random curve is expressed not by mathematical equation but by discrete points, which makes it very difficult to evaluate the profile error.
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