因为只有有限个比特，今天的重点就是，它就这么点精度。
But because you only have a finite number of bits, the takeaway for today is that there's only so much precision.
同时，对呆用平台法检测周期误差的棱镜对点精度进行了分析。
The accuracy of the centric position of prism used to test cyclic errors with platform method is also analysed.
通过算例，了解测设放样元素误差和控制点误差对放样点精度的影响规律；
The effect laws of setting out element errors and control point errors on setting out point accuracy are known by a computation example.
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