以下为句子列表：
英文: Using three-dimensional tomographic imaging results of 2o×2o grid S wave velocity and 15'×15' grid average gravity anomaly in North China, this paper adopted inversion with constrained least squares method and, as a result, obtained density distribution r
中文: 摘要利用华北地区的2o×2o网格S波速度三维层析成像结果和15o×15o的网格平均布格重力异常，采用约束最小二乘方法反演，得到了华北地区岩石圈内6个层面上的密度分布结果。
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