• 1. 差数机: Difference Engine
• 2. 差数机差: probable error of difference
• 3. 随机误差数列: random error series

• 1.本文分析了上述各种情况和所产生的误差数据的特性，提出了保持圆刻机精度的几点建议。
  The characteristic of the error data is analyzed in this paper. Some methods about holding the accuracy of machine are suggested.
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