垂直磁偶源的垂直磁场及其时间导数随时间变化的曲线，偶极源与接收装置的距离100m，均置于100欧姆米的均匀大地表面上-The distance of the vertical magnetic field of the vertical magnetic dipole source and its time derivative of the curve changes with time, the dipole source and receiving apparatus 100m, are