Besides, error curve and error ellipse are analyzed.So, it is shown that error ellipse is inutility, and error curve is useful and effective.
对中桩
误差曲线和误差
分析认为，误差无实际意
，误差曲线实用而有效。
物
词
词
乎;Besides, error curve and error ellipse are analyzed.So, it is shown that error ellipse is inutility, and error curve is useful and effective.
对中桩误差曲线和误差分析认为，误差无实际意，误差曲线实用而有效。
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