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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
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			Application of the opposing coils transient electromagnetic method in investigation of mined-out areas of a gold deposit
			 
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		 图2. 电流环磁场计算柱坐标  | 
	
Fig.2. Cylindrical coordinates of current loop magnetic field calculation  | 
	
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