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在疏松层较厚地区进行电法勘探时，低阻屏蔽影响是长期得不到解决的重要干扰因素，它使视电阻率曲线只能简单反映基岩起伏形态，而难以了解基岩内部电性变化情况，因而大大降低了电法的勘探率果。
The low impedance shielding effect is an important and disturbing factor that can not be solved for a long time when electrical prospecting is carried out in the thicker area of loose soil layer. It makes the apparent resistivity curve simply reflect the rocking and rolling patterns of bedrock, and it is difficult to understand the internal electrical properties of bedrock Changes, thus greatly reducing the efficiency of the exploration of electricity law.