中文说明：应用表面粗糙度曲线上寻找上下包络线，其过程：找到极大极小值，之后画出直线
English Description：
Using the surface roughness curve to find the upper and lower envelope, the process is to find the maximum and minimum value, and then draw a straight line
Using surface roughness curve to find the upper and lower envelope
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中文说明：应用表面粗糙度曲线上寻找上下包络线，其过程：找到极大极小值，之后画出直线
English Description：
Using the surface roughness curve to find the upper and lower envelope, the process is to find the maximum and minimum value, and then draw a straight line