短語詞組短語gravitational residual anomaly 賸餘重力異常feature of gravitational precursory anomaly 重力前兆異常特征gravitational and magnetic anomaly 重磁異常local gravitational anomaly 侷部異常gravitational anomaly method 引力反常方法regional gravitational and magnetic anomaly 區(qū)域重磁異常場 返回 gravitational anomaly