Are there any visible arc marks on upper surfaces LPS rods?

避雷针的上部表面是否有可见的电弧放电痕迹？

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Visible light telescopes can resolve a piece of sky just a few arc seconds across — at least 60 times a smaller patch of sky than can be resolved with the human eye.

光学望远镜在数角秒内就能获取一张星空图—至少比肉眼能获取的大60倍。

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The results indicate that it has visible effect on restraining arc discharge and hollow cathode discharge as well as ion nitriding on high-chrome steel material surface.

结果表明，交流脉冲放电在抑制弧光放电和空心阴极效应方面是非常有效的，对于高铬钢材料表面的离子渗氮作用是明显的。

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Activated by pulling out a grenade-like pin and palming an embedded finger pad, the Armstar BodyGuard 9XI-HD01 sparks a loud and visible arc of electricity between its wrist-mounted taser spikes, a sight that inventor David Brown hopes will encourage would-be crooks to surrender.

ENGADGET: BodyGuard stun-glove leaps out of comic books, into the arms of LA Sheriff's Department