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
差曲线和差椭圆分析认为，差椭圆
实际意义，差曲线实
而有效。
,
益
物
;;,有益,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.
对中差曲线和差椭圆分析认为，差椭圆实际意义，差曲线实而有效。
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