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1·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。

2·The mathematical mean of the physical quantity has multiple expressions forms, including arithmetical mean and geometric mean, etc.

物理量的数学平均值有算术平均值和几何平均值等多种表达形式，这些数学平均值所表达的物理含义是不同的。

3·Ways to increase precision, such as arithmetical mean and implant control point, were studied and their principles and characters were analyzed and discussed.

研究了算术平均值法、加入控制点法等多种提高精度的方法，分析和讨论了其原理和特点。

4·The arithmetical mean concentrations of co and NO emissions of EFI cars were calculated and their absolute values were predominantly contributed by high concentrations with low frequency.

对电喷车的CO和NO排放浓度做算术平均，其绝对值主要由出现频率少的高浓度值所贡献。

5·Mean value problems of arithmetical functions play an important role in the study of analytic number theory, and they relate to many famous number theoretic problems.

算术函数的均值问题在解析数论研究中占有十分重要的位置，许多著名的数论难题都与之密切相关。