This paper analyzed the effect of shielding between hollow grounding devices and between hollow grounding device and ground grid.
并通过模拟试验分析了接地坑、自然水对降低空腹式接地装置的接地电阻的作用。
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Their seed heads raised just high enough above the ground to catch the wind, the plants are no bigger than they need be, their stems are hollow, and all the rigidity comes from their water content.