Based on the study of machine mechanism of PMD EDM, its rough machine efficiency and rough machine surface roughness are experimentally researched.

在对混粉电火花加工机理进行系统研究的基础上，对混粉电火花粗加工中的加工效率和加工表面粗糙度进行了实验研究。

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The PlayStation was technologically impressive, with its ability to splash over 300, 000 polygons on a television screen in a single second. (Nearly all videogame graphics are composed of polygons so "polygons per second" is a rough and ready measure of a machine's power.) Perhaps more important, Sony carefully forged and nurtured good relationships with third-party software developers, ensuring a steady supply of great games for its system.

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The technique allows the machine to be made of soft materials so it can squeeze through tight spaces and mould its shape to rough terrain.

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