最后作为复杂机械产品的应用实例，建立了港口门座式起重机的CAD系统模型。

As an example, we build the model of the portal crane CAD system to verify the above techniques and criterions.

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随着变频器的日益普及，其在港口设备上得到了广泛的应用，门座式起重机也普遍采用了变频控制技术。

Along with popularizing of inverter increasingly, inverter is widely used in many harbour facilities such as portal crane.

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