二次近似 second approximation
首次近似 first approximation
渐次近似法 gradual approximation
一次近似 first-order approximation ; approximation of first degree
一次近似值 first approximation
逐次近似 successive approximation ; successive approximate values ; approximation successive
第一次近似法估算 first order estimate
一次近似值初步近似 first approximation
第一次近似值 first appoximation value
逐次近似值 successive approximate values
给出判定平衡稳定性的一次近似方法及其判据；
The stability criteria for the equilibrium state are obtained.
二次近似解达到薄壳理论所具有的精度，一次近似解也具有足够精度。
The second approximation of the solution is of the same accuracy as theory of thin shells, and the first approximation is also sufficiently precise for engineering computation.
通过非线性系统的线性化方法，讨论了一类非线性时变微分系统的解关于部分变量指数稳定的一次近似。
The first order approximation of the partial exponential stability of nonlinear time-varying systems is investigated by linearization approach of nonlinear systems.
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