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目前常见的Video CD (VCD) 视频数据所采用的数据压缩格式是【2】。

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交换式局域网从根本上改变了“共享介质”的工作方式，它可以通过支持交换机端口结点之间的多个【17】达到增加局域网带宽，改善局域网的性能与服务质量的目的。

Would you mind me (open) ______ the window to let fresh air in

【13】是衡量数据传输系统正常工作状态下传输可靠性的参数。

During the past years, intelligent technology has evolved (116) three generations. The first was characterized by tools such as prolog and OPS. prolog is a simple backward-chaining environment, and OPS is a simple forward-chaining environment. This led to the second generation of knowledge-engineering environments. Its goal was to model, prototype and construct (117) systems.All three generations were oriented toward generic (118) and represented generalized implementation environments for the construction of expert systems. knowledge bases and AI applications.Some of the solution-oriented products are also seamlessly integrated with generic knowledge-engineering environments, permitting end users to add (119) rules and objects, as well as predefined knowledge-based logic to address problems in manufacturing simulation.Marketplace orientation is rapidly (120) toward solution-oriented intelligent product environments. the fourth generation represents a new line of thinking and ’ develop-merit by commercial fu-ms. will reduce the cost risk and development time associated with problem solving. （118）是（）

A. custom
B. knowledge
C. through
D. problem solving