Next, based on PID control's structure, the need of practical control engineering and the realizable conditions, it is analyzed that PID control's special advantages and the theoretical argument.

接下来，从PID控制的结构形式、实际控制工程需求和实现条件分析了PID控制的独特优点和理论依据。

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Design calculation has been made for this kind of special structure vessel with engineering design calculation method.

文中运用工程设计计算法，针对该特殊结构的容器进行了设计计算。

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For product adopting field foaming pumping pouring shape, also can factories, Prefabricated forming, used for special structure roofing engineering construction, quick and convenient.

给产品采用现场发泡泵送浇注成型，也可工厂；预制成型，用于特殊结构屋面工程，施工快捷方便。

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