This paper gives a method to calculate the arithmetic square root by iteration with given accuracy, analyses the iteration error and provides a selected range of initial value with the given accuracy.
本文给出了在预定精确度下用迭代法计算算术平方根的方法，并分析了迭代的误差，给出了预定精确度下初始值的一个选取范围。
The measurement error source of center of cone gravity, arithmetic and uncertainty of ATS are given, and the measurement accuracy of cone center of gravity is improved.
着重分析了锥体重心测量系统测量误差的来源、算法及系统整体测量不确定度的评定，从而可以提高锥体重心的测量准确度。
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