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等值反磁通瞬变电磁法在金矿采空区探测中的应用
任喜荣(), 李欣, 周志杰
Application of the opposing coils transient electromagnetic method in investigation of mined-out areas of a gold deposit
REN Xi-Rong(), LI Xin, ZHOU Zhi-Jie

图2. 电流环磁场计算柱坐标

Fig.2. Cylindrical coordinates of current loop magnetic field calculation