As a subject matter expert in Six Sigma, I can explain the acronym "CPK" within the context of this quality management methodology.

In Six Sigma, CPK stands for Process Capability Index. It is a statistical measure that indicates how capable a manufacturing process is of producing parts within specified limits. A higher CPK value generally indicates a more capable process, with a value of 1.0 or higher being considered acceptable in many industries. CPK is calculated by comparing the natural tolerance limits of a process to the engineering specification limits of the product.

Here's the translation in Chinese:

在六西格玛（Six Sigma）中，CPK代表过程能力指数。这是一个统计度量，表明制造过程生产出符合指定限制的零件的能力。一般来说，CPK值越高，表示过程的能力越强，在许多行业中，1.0或更高的值被认为是可接受的。CPK是通过比较过程的自然公差极限和产品的工程规格极限来计算的。

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Process Capability Index, Cpk. Description: Cpk is a short term process index that numerically describes the "within subgroup" or "potential" capability (Ppk is long term indicator) of a process assuming it was analyzed and stays in control.read more >>