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
误差曲线和误差椭圆分析认为，误差椭圆
义，误差曲线用而有效。
处,没有用,
物用;,有效;
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椭圆分析认为，误差椭圆义，误差曲线用而有效。
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