Patients and METHODS: 100 patients with intermediate probability of bile duct stones were randomly allocated to EUS or ERC.
患者和方法：100例中等概率胆管结石患者被随机分配到EUS或ERC组。
Thirdly, calculation method and step for the probability of the element in safety state, intermediate state and failure state are given which is based on the general reliability analysis.
再次，在已有的可靠度计算方法的基础上，给出了单元工作在安全、中介和失效三种情况下，其工作概率的计算方法和步骤。
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