- 失能伤害频率
- difr = disabling injury frequency rate: 造成缺勤的工伤发生率
- disabling injury frequency rate: 残伤频率; 造成缺勤的工伤发生率
- disabling injury severity rate: 残伤严重程度频率; 工伤缺勤率
- disr = disabling injury severity rate: 工伤缺勤率
- disabling injury: 残障性伤害; 造成缺勤的工伤; 致残伤害
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