研究和分析双机制设计体制的可靠性结构模型，进而推导和建立双机制导航设备的可靠性数学模型是十分必要的。
Analyze and conclude reliability model of designing double system to drive and build the mathematics model on the double system navigation equipment reliability is necessary.
通过对供应链的系统分析，归纳总结了供应链的基本结构模型，并分析了其可靠性的特征量。
Through a systematical analysis of supply chains, their basic structure models are summarized, and the characteristic quantities of their reliability are analyzed.
通过对供应链的系统分析，归纳总结了供应链的基本结构模型，并分析了影响其可靠性的主要因素。
By analyzing supply chains systemically, this paper summarizes the basic structure models of it, and analyzes the main factors that affect the reliability of the supply chain.
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