Be able to design the correct SPC chart type, rational sub-grouping, and sampling frequency.

能够设计正确的制程能力图的种类，明确抽样数量和抽样频率。

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Grouping is indicated by parentheses: any sub-expression contained in parentheses is treated as if it were atomic for the purpose of further grouping or repetition.

由括号表示分组：括号中包含的任何子表达式都被看作是用于以后分组或循环的原子。

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A method taking multi samples as sub modes and grouping face modes into partial intersection ones was proposed to reduce computation and improve system extension property.

将人脸模式的多个样本作为子模式，并将较多的人脸模式部分相交地分组，以减小计算量和便于识别系统的扩展。

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