Part change and structure change were two factors causing PFA evolution.Part change leading to PFA evolution was discussed in particular. 产品族结构进化的因素包括零件变化和结构变化,重点研究了由于零件的变化而引起的产品族结构进化问题。
Strictly speaking, the classical definition of thixotropy pertains only to those fluids that exhibit reversible structural changes. 严格说来,对触变性所下定义只限于那些表现可逆性结构变化的流体。
The microstructures change of super-high strength of austenite stainless still silk in multi-ply drawing were analysed. 分析了超高强度奥氏体不锈钢丝在多道次拉拔过程中的组织变化。