In this paper, the methods of variation of parameters for salving the Vacco dynamical equations are given.
本文使用全微分法和常数变易法，从不同角度给出伯努利方程通解的公式。
The methods and procedures for determining the parameters in those models were defined, and the rules of variation of some parameters with change of direction were studied.
拟定了求定模型参数的方法和步骤，研究了参数随方向变化的规律。
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