According to class-object level, structure level, subject level, attribute level and service level, we analysis the class hierarchy of hydraulic system, their interrelation and their communication.

按照类——对象层、结构层、主题层、属性层和服务层五个层次分析了液压系统的类层次构成及其连接与通信。

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According to class-object level, structure level, subject level, attribute level and service level, we analysis the class hierarchy of hydraulic system, their interrelation and their communication.

按照类——对象层、结构层、主题层、属性层和服务层五个层次分析了液压系统的类层次构成及其连接与通信。

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