文中对引起水套炉发生失效的各个因素进行系统分析，建立了以水套炉失效为顶事件的失效故障树。
All factors that may make the waterjacket heater failure was analyzed in the paper, and builds a fault tree with failure of water-jacket heater as top event was set up.
利用最大似然估计原理，给出了构建系统发生树的模型和算法。
A model and an algorithm were provided for constructing phylogenetic tree based on the principle of maximum likelihood estimate.
系统发生树分析表明：卢龙毒株ll36755与其他已经报告的两种猪和一种人类的G5型毒株可能具有相同的起源。
Phylogenetic analysis showed Lulong strain LL36755 clustered together in the same lineage as two other reported porcine G5 rotavirus strains and one reported human G5 rotavirus strain.
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