Provide mechanical ventilation to maintain vapor concentrations below permissible exposure levels 提供机械通风，将气体浓度控制在允许的逸出量以下。
3.
Safety of laser products - part 9 : compilation of maximum permissible exposure to incoherent optical radiation 激光产品安全.第9部分:最大允许非相干光辐照的汇集
4.
Safety of laser products - part 9 : compilation of maximum permissible exposure to incoherent optical radiation iec tr 60825 - 9 : 1999 激光产品安全性.第9部分：非相干光辐射最大允许曝光
