本文讨论如何正确理解触头间的推斥电动力，并用能量平衡原理对触头推斥电动力的计算式作了分析与推导。
This paper discusses how correctly understand the repulsion force between the contacts, and the formula is derived for calculating the force by principle of energy balance.
来自彗星的微小粒子被太阳辐射压向后推斥，形成尘埃尾。
Dust tails are created when small particles from a comet are swept backward by the Sun's radiation pressure.
来自彗星的微小粒子被太阳辐射压向后推斥，形成尘埃尾。
Dust tails are created when small particles from a comet are swept backward by the Sun's radiation pressure.
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