Three methods for gravity field recovery are mainly studied from the views of observation equation, (1) numerical differential method, (2) energy balance approach, (3) numerical integration method.

从建立观测方程的角度来说，主要研究了三种恢复地球重力场的方法：(1)数值微分法，(2)能量守恒法，(3)数值积分法。

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Time precision integration method is a mature numerical algorithm to solve the ordinary differential equation.

精细积分法是求解常微分方程的一种成熟的数值算法。

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The ordinary differential equation of round laminar jet of power-law fluid is derived, and the solution of this equation by numerical integration is obtained.

用层流边界层方程，导出幂律流体轴对称层流自由射流的常微分方程，并给出其方程的数值解。

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