1、 The characteristic parameters of fluid during the transition in boundary layer are obviously different from that of the laminar flow or the turbulent flow.
边界层转捩流动的特征参数明显不同于层流或湍流，转捩流动的这些特征直接影响着流体的动力、传热特性。
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2、 Causes to the laminar defect of the umbrella bone steel occurring in the process of cold forming are analyzed by chemical analysis and microstructure analysis.
采用化学分析及微观组织分析的方法，对伞骨钢压扁后成型过程中所产生分层缺陷的原因进行分析。
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