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针对石油化工行业风险评价中风险表征研究薄弱的现状，提出用三种不同的风险率表征不同情况的风险．结果表明，不同类型风险用不同的表征方法，实用性强且能反映事故风险的特点，更具合理性．
In view of the weak status of risk characterization in the petrochemical industry risk assessment, three different risk ratios are proposed to characterize the risks in different situations. The results show that different types of risks are more reasonable with different characterization methods, practicality and the ability to reflect accident risk.