the weighted arithmetic average
加权算术平均数
以上为机器翻译结果，长、整句建议使用 人工翻译 。
By bringing forward the concept of sliding coefficient, it is proved that the sliding coefficient is fitted to the principal of weighted arithmetic average regarding the sliding block as weight.
提出滑动系数概念，证明了滑动系数符合以重量为权的加权平均原则；
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