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| 11. | In the case of roller bearings, the rolling friction is substituted for sliding friction. |
| 就滚柱轴承而论，滚动摩擦代替了滑动摩擦。 |
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| 12. | It reduces friction and makes the rolling parts work smoothly. |
| 它能减少摩擦，并使旋转零件活动自如。 |
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| 13. | condition of cold rolling is affected by many factors.This paper shows the relationship between the friction |
| 主要研究了在冷轧过程中,轧机辊缝摩擦系数受轧制速度、相对压下量以及乳化液浓度因素影响的变化规律。 |
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