【名词&注释】
安全性(safety)、公开密钥(public key)、实际成本(actual cost)、客户端连接(client end connection)
[多选题]下列哪两项正确描述了由WPA定义的无线安全标准?（）
A. 使用公开密钥的认证方法
B. 当客户端连接(client end connection)的时候都要进行动态密钥交换
C. 包含PSK认证
D. 定制了一个经常更换的静态的加密密钥来增强安全性
查看答案&解析
举一反三：
[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
A. 项目 PV EV AC
B. 甲 1200 900 700
C. 乙 1200 700 900
D. 丙 1200 900 1000
E. 项目甲
F. 项目乙
G. 项目丙
H. 项目甲和项目乙
[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.
A. modify
B. changing
C. modifying
D. changed
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