这一系统采用多级子结构分析技术，可以适应各种类型航空结构的线性静力分析。

By using multilevel substructure analysis and finite element displacement method, this system is suitable for various linear static analysis of aeronautical structures.

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本文从商品性质的角度出发，对多级配送系统库存结构的优化理论进行了研究。

This dissertation studied the optimal theory of multi-echelon distribution system inventory structure from the perspective of product characteristics.

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采用多级模态综合技术并利用结构旋转对称的特点，建立包括转动部件和固定部件在内的水轮机整机系统动力特性分析模型。

A model for dynamic analysis on a whole hydroelectric machine system was studied by multiple step mode synthesis technique, which consists of rotary and fixed components.

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