Inverson of circle: Into a circle, if the circle pass through inversion center o, it becomes a straight line.
圆的反演：反演成一圆。但当圆通过反演中心时变成一直线。
Then did I pass? Und the circle of eight.
然后我经过八的周期。
Half-circle model and full-circle model, fixed heat source and moving heat source, single pass and multi-pass welding are used for comparison.
比较了半周模型和全周模型，固定热源和移动热源，单道焊和多道焊下的分析结果。
Half-circle model and full-circle model, fixed heat source and moving heat source, single pass and multi-pass welding are used for comparison.
比较了半周模型和全周模型，固定热源和移动热源，单道焊和多道焊下的分析结果。
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