The principle of working out is expounded, and in particular the formula for calculating the rating of motor parts in the new established rating is analyzed and summarized.

阐述了编制原理，尤其对新定额的建立中的电机零件定额的计算公式进行了分析和总结。

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From analysis of combined needle roller bearing, the estimating formula of basic dynamic load rating for above bearing is derived.

从滚针组合轴承结构分析着手，推导出滚针组合轴承的基本额定动负荷估算公式。

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