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if friksjon in kulelager and rullelager, her with tråsykler as enkleste eksempel, and where it must forbedring most direkte trenges

机译：如果球轴承和滚动轴承有摩擦，这里以tr u00e5sykler为例，这是最简单的示例，在该示例中必须直接改善

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