Therefore, the activation of the surface modification of polytetrafluoroethylene, mostly by plasma processing method, convenient operation, significantly reduce the wastewater treatment.

因此，目前对于聚四氟乙烯表面的活化处理，大多采用等离子体处理法进行，操作方便，还明显减少了废水处理。

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The basic process of surface treatment can be divided into three stages: pretreatment, middle after processing.

表面处理的基本过程大致分为三个阶段：前处理，中间处理和后处理。

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Tolerances cover dimensional variation and surface-roughness range and also the variation in mechanical properties from heat treatment and other processing operations.

公差这个概念既包括尺寸偏差范围和表 面粗糙度范围， 也包括由热处理和其它处理操 作所引起的机械特性的变化。

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