提供介面供设计工具选取元件。

Provides an interface for a designer to select components.

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根据系统的特点，通过静态设计，选取元件参数，然后通过动态建模分析以及几种控制策略的仿真研究。

According to the feature of this system, through static design and selecting component's parameter, then carrying out dynamic model's establishment and simulation of several kinds control strategies.

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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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