分析了这种新型树状分形冷却通道结构的几何特征和阻力特性。
Secondly, the geometric characteristics and the feature with respect to pressure drop of the new cooling structure were analyzed.
参数曲线高速数控插补时，进给速度规划需要综合考虑机床动力学特性和曲线几何特征的限制。
Velocity planning for curved path interpolation in high CNC machining should be bounded by both dynamic properties of the machine tool and the geometrical properties of the curved path.
动态物理模型以直观的物理方式动态、实时响应用户操作，具有物理特性与几何模型和行为模型相融合的特征。
Dynamic physical model makes dynamic and real time response to user operation in a visual physical way, and is the fusion of physical characteristics, geometric model and behaviour model.
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