Single plane mean bore diameter deviation.
单一平面平均内径偏差。
Single plane mean bore diameter deviation.
偏差减为一毫米。
Mean bore diameter: arithmetical mean of the largest and smallest single bore diameters in one plane.
平均内径：同一平面上最大和最小内径的算术平均值。
Mean bore diameter: arithmetical mean of the largest and smallest single bore diameters in one plane.
平均内径：同一平面上最大和最小内径的算术平均值。
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