安全保护系统从结构上看是逻辑系统，它的可靠性分析可以归结为三状态逻辑系统的可靠性分析。
Protection system is a logical system for struction. The analysis of reliability of protection system may be reduced to the analysis of reliability of the "three state" logical system.
安全保护系统从结构上看是逻辑系统，它的可靠性分析可以归结为三状态逻辑系统的可靠性分析。
Protection system is a logical system for struction. The analysis of reliability of protection system may be reduced to the analysis of reliability of the "three state" logical system.
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