At each iteration, a master direction is obtained by solving one direction finding subproblem which always possesses a solution, and an auxiliary direction is yielded by an explicit formula.

在每次迭代中，主方向是通过求解一个总有解的寻找方向子问题产生，而辅助方向是由一显式公式计算产生。

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By formula deriving and data calculating, the errors resulted from the two different methods are obtained, and their effects on solving practical engineering problems revealed.

并通过公式推导及具体数据计算，找出两种不同处理结果的误差，及对解决工程实际问题的影响。

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By use of the common formula for solving the time variations of the crustal density, the approximative plane formula is derived and its numerical calculation method is given.

采用求解地壳单层密度变化的一般公式，导出其平面近似公式并给出了相应的数值计算方法。

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