情势变更，显失公平，成本核算，严重亏损。
Change of circumstances, Obvious unjust, Cost accounting, Economic losses.
本文从设计，制作的角度，介绍一种低成本的，具有数显及对讲功能的传呼系统。
A low cost communication device with alphanumeric display and dialogue function is introduced from the Angle of design and manufacture in this paper.
用80C196单片机作为显示处理机构成一块基于AT总线的插卡，用以取代原平视显示器教学模拟器显控计算机和矢量产生器插件板，使系统结构简化、成本降低，并提高系统可靠性。
An 80C196 MCS based on AT Bus replaces the Display Computer and Vector Generator board of the old HUD Teaching Simulator. It reduces system form and costs, also improves system reliability.
用80C196单片机作为显示处理机构成一块基于AT总线的插卡，用以取代原平视显示器教学模拟器显控计算机和矢量产生器插件板，使系统结构简化、成本降低，并提高系统可靠性。
An 80C196 MCS based on AT Bus replaces the Display Computer and Vector Generator board of the old HUD Teaching Simulator. It reduces system form and costs, also improves system reliability.
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