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图5 电阻率25 Ω·m均匀半空间偏移距1 000 m处大地脉冲响应及添加50 Hz正弦噪声后信号

Fig.5 Earth impulse response of 25 Ω·m homogenous half space at an offset of 1 000 m and contaminated signal by 50 Hz sinusoidal noise