In this paper the existence of contact voltage drop is discussed and the method of measuring contactdrop is given.
本文讨论了接触压降的存在，并给出了测量接触压降的方法。
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When the auto enters the highway system, a retractable arm will drop from the auto and make contact with a rail, which is similar to those powering subway trains electrically.
If you wanna tie anchor to it and drop it right into the ocean, that's no problem, because plant fibers can stand up for months, even years, in direct contact with salt water.