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。
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。
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