正确答案: BC

当客户端连接的时候都要进行动态密钥交换 包含PSK认证

题目：下列哪两项正确描述了由WPA定义的无线安全标准?（）

解析：答案：BC

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举一反三的答案和解析：

[单选题]根据如表一所示，()最有可能在时间和成本的约束内完成表一

项目甲

解析：

本题可根据公式SPI=EV/PV和CPI=EV/AC来判断。SPI的值越大，说明项目实际进度越会相对提前计划进度。CPI的值越大，说明项目的实际成本越会相对预算有所节约。

[单选题]Due to a constantly(66) environment, a poor understanding of the user's needs and preferences, as well as a(67) of willingness to modify.(68) organizational structures and decision models, the full economic potential of Web Information Systems (WIS) has not been realized by now. The data object types of the(69) meta. model, the Extended World Wide Web Design Technique (eW3DT), provide hypertext designers(70) a conceptual, user-centric framework and graphical notation for the construction of both,(71) and customized models, during the software development(72) of commercial WIS. A reference model as a normative concept represents an abstraction of a(73) company, its functional units, or its Web Information System and is intended to streamline the design and implementation of complex applications at(74) costs. As precondition for pursuing a partial globalization strategy,eW3DT(75) between technical and content-specific responsibilities for designing, implementing, and maintaining WIS.

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