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本文对pstro—sonde岩性探测技术理论中有关讨论电磁波衰减、仪器的重复性、探测精度的问题，从物理试验结论成立的边界条件进行了探讨，指出在理论上不要错把甚低频或超低频段的天然电磁场误认为该频段内的天然电磁波来对其进行推理和计算，从而得出错误的结论．
In this paper, we discuss the boundary conditions of pstro-sonde lithology detection theory, which discuss electromagnetic wave attenuation, instrument repeatability and detection accuracy. The boundary conditions established from the conclusion of physical experiment are discussed. It is pointed out that in theory, we should not mistake very low frequency or ultra-low The natural electromagnetic field in the frequency band is mistakenly identified as the natural electromagnetic wave in the frequency band to reason and calculate it, and the erroneous conclusion is reached.