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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。

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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

汉字终端是一种独立主机的输入输出设备。它不仅具有汉字输入、显示和打印功能，而且还具有汉字造字、编辑和通信功能。汉字终端与主机一般通过RS-232C以 (36) 方式传送 (37) ，因此两者之间至少应有 (38) 根连接线。汉字终端在设置通信参数时应设为 (39) ，其字模库存放在 (40) 中。

A. 7位数据无校验位
B. 8位数据无校验位
C. 7位数据加一位校验位
D. 8位数据加一位校验位