For a naval ship with a long strength superstructure and a lot of hatch, it is difficult to evaluate the hull girder's strength by general beam theory because of the complexity of the hull structure.
当舰船设有长度较长但开口较多的上层建筑时，其船体结构的复杂性使船体总强度很难用常规的梁理论方法确定。
Interaction between foundation and superstructure has been analysised concretely with BEM theory.
利用边界元法对地基与上部结构相互作用做了较为具体的理论分析。
As for the synthesis problem of distillation separation sequences, the method of graph theory is applied to study network superstructure.
针对精馏分离序列综合问题，运用图论方法研究网状超级结构。
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