With the case study of a multi - port Ethernet switch controller, the system - level model is developed.

以多端口以太网交换控制电路为对象, 开发了系统级模型.

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By fuzzy method, the two - level model of risk assessment of natural disaster on city is suggested.

利用模糊集方法建立了城市自然灾害风险评价的二级模型.

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