题目内容

帧中继采用【7】方式来传送数据。

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一般来说，网络操作系统可以分为两类：一类是面向任务型NOS：另一类是【14】 NOS。

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. （117）是（）

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

一条物理信道直接连接两个需要通信的数据设备，称为【4】通信。

网络的OSI参考模型分为7层，其中最底层是【8】。