重点介绍了系统中元件自动选取和统计功能的实现。

The realization of automatic selection and statistic function of elements in the system is introduced.

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选取要切割的第一个元件，即方管。

Select first the component to cut, the square tube.

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等效参数化模型使用较少的模型参数，关键在于物理元件及其力学特性参数的选取；

The equivalent parameter model uses less parameters, but the selection of elements and their corresponding parameters plays an important role in this modeling method.

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