GEARMASTER PGP oils are used in high-load industrial gear systems such as spur gears, bevel gears, epicyclical gears and worm gear pairs.
油都用在高负荷工业齿轮系统，如直齿圆柱齿轮，锥齿轮，行星齿轮和蜗轮副。
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The complicated structure of the epicyclical gear train with multidegrees of freedom and planet carriers could be predigested into the topological graph by adopting the knowledge of graph theory.