Fine datum choice: Must conform to the datum superposition principle, chooses the design datum or the assembly datum as far as possible takes the localization datum.
精基准选择：要符合基准重合原则，尽可能选设计基准或装配基准作为定位基准。
A group of equations of assembly datum variation is proposed to model assembly tolerance chain and tri-dimensional tolerance analysis result is obtained through solving those equations.
提出用装配基准变动方程组来建立装配公差链模型，通过求解此方程组获得三维装配公差链的分析结果。
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