Material compoSition, compacting method and die structure of P/M bush with step and prismatic surface on cylinder were outlined.
介绍带台阶并在圆柱体上有三棱面的粉末冶金村套的材料配方、压制方法和模具结构。
Finally, this paper took a production line of 5v engine cylinder head for example, and proposed a process to design prototype system, to improve the efficiency and accuracy of product line p.
最后，以5 V发动机缸盖生产线的设计为例，完成原型系统的开发，提高了生产线规划的效率和准确度。
The cylinder anisometropia in PMMA group was worse than silicon–gelatum group and controlling group, the differences were significant(P<0.05).
术后PMMA组术眼柱镜屈光度数值较大，与硅凝胶组及对照组比较，差异有显著意义（P<0.05）；
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