While assembling the utility model, the structure prevents locating errors and reverse cover board arrangement.

在装配产品时, 该结构也能起到定位防错作用,防止盖板位置装反.

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Locating errors includes misalignment error with reference point and displacement error with reference point.

定位误差包括基准不重合误差和基准位移误差,基准位移误差计算比较麻烦.

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