arc of approach
... 简正振动模态 normal mode of oscillation 渐近弧 arc of approach 渐远弧 arc of recess ...
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... approach arc of contact 进入啮合弧长度 approach arc of 渐近弧 structural approach limit of tunnel 隧道建筑限界 ...
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并据此利用渐近分析方法分析了真空电弧中弧柱的磁收缩物理过程和电流密度分布，最后分析了电极参数对电弧收缩的影响。
Then the physical process of current constriction and the influence of electrode dimensions on it are analysed. This analysis can be used to explain the effect of axial magnetic fields t…
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