To analyze the prevalence characteristics of pneumoconiosis from 1949 to 2004 in Shanghai to provide the reference for decision-making the further preventive measure.
分析上海市1949 ~ 2004年尘肺的发病状况和新发尘肺特点，为新形势下尘肺病的防治提供决策参考。
Integrated tradeoff for preventive maintenance is a kind of decision-making analysis for preventive maintenance of whole system as well as all the parts of it during the design phase of materials.
预防性维修综合权衡就是在装备的设计阶段对整个系统以至各组成单元做出预防性维修的决策分析。
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