Drag to add a dimension to an arc or circle. Place line end at arc center, and yellow diamond on arc.
通过拖动可向弧或圆添加尺寸。将线端放在弧中心上，并将黄色的菱形放在弧线上。
Drag to add an arc with adjustable size and orientation. Complementary arc can be shown.
拖动此形状，可添加一条大小和方向可调的弧线。可以显示互补弧线。
However, the effect of electromagnetic force is stronger than that of the plasma drag force in helium arc.
在氩弧下，影响熔池形貌的另一个重要的驱动力是气体剪切力，而氦弧下则是电磁力。
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