重磁正演模拟 地下两个相同球体不同距离时重力异常模拟，及各种数据处理；地下两个大小不一球体重力异常模拟及分离；地下球体磁倾角模拟；-Gravity and magnetic forward modeling Underground two identical spheres at different distances simulate gravity anomaly, and a variety of data processing simulation and abnormal s