SV-5 Operational Activity to System Function Traceability Matrix Maps system internal behavior (realizations) to operational external activities (specification). Model resident text matrix

SV-5 系统功能可溯性矩阵的运作活动 将系统内部行为（实现）映射到运作外部活动上（规范）。

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Based on IEEE standard and domestic and overseas engineering practice, the fallback system is studied in detail. The definition, function, operational principle and design specification are presented.

本文在结合IEEE标准以及国内外的工程实践的基础上，对后备系统进行了深入地研究，给出了后备系统的定义、功能、工作原理、设计要求。

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