Then, the affecting factors and results are graded according to experts grading method, thus a risk assessment for gas pipeline leakage is achieved. 根据专家评分法，对危害因素指标和后果进行评分，实现管道工作状态的风险评价。
Methods According to Hygienic Standards for the Design of Industrial Enterprises, an all-around recognition to harmful factors was performed in small and medium enterprises. 方法参照工业企业设计有关卫生标准，识别铁合金生产中小企业的工艺流程中可能存在的职业危害因素。
