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。
The choice precision is high, the installment stable reliable surface is the fine datum.
选择精度高、安装稳定可靠表面为精基准。
The choice precision is high, the installment stable reliable surface is the fine datum.
选择精度高、安装稳定可靠表面为精基准。
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