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表面光洁度分14级,它由参数R_a或R_z决定(见下表)。R_a和R_z的含意是;1.不平度的算术平均偏差值R_a:测量轮廓上各点至轮廓中线绝对值的算术平均偏
Surface finish is rated at 14 levels and is determined by the parameters R_a or R_z (see table below). The meaning of R_a and R_z is; 1. Arithmetic average deviation value of roughness R_a: Arithmetic mean deviation of the absolute value of each point on the measurement contour to the profile centerline