The affection of the driving ratio and position-changing coefficient on the side contact macula of the gears was analysed and calculated.

本文分析计算了传动比和变位系数对齿轮副接触斑点的影响；

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We believe that DirecTV may need to make some strategic investment soon in order to better position itself against changing industry dynamics and diversify its business risk.

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Given this information, why isn't the mayor or the police commissioner changing position some to at least recognize we can reduce the number of stops without jeopardizing the public safety?

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He recommends changing position about every 15 minutes.

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