量子测量中精度的标准极限，源于与可计数离散粒子，而不是连续量相关的统计误差。
The standard limit on the precision with which a quantum measurement can be carried out is due to the statistical error associated with counting discrete particles rather than continuous quantities.
这些误差严重影响着陀螺仪的精度。
步进电机有一定的步距精度，没有累积误差。
Stepping motor has certain step distance, have no cumulative error precision.
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