Besides, error curve and error ellipse are analyzed.So, it is shown that error ellipse is inutility, and error curve is useful and effective.
对中桩的误差曲线和误差椭圆的分
，误差椭圆无实际意义，误差曲线实用而有效。
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.
对中桩的误差曲线和误差椭圆的分，误差椭圆无实际意义，误差曲线实用而有效。
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