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permissible exposure limit
avia.	允许曝光极限
chem.	允许暴露极限
el.	允许逸出限量; 允许排放限量
med.	容许暴露接触限量
tech.	容许曝露极限; 容许辐照限度; 容许暴露极限
permissible exposure limit An exposure limit that is set for exposure to an hazardous substance or harmful agent and enforced by OSHA (Occupational Safety and Health Act) as a legal standard. It is based on time-weighted average concentrations for a normal 8-hour work day and 40 hour work week
environ.	允许暴露极限 (这是由职业健康安全局(管理职业安全和健康行为)对曝光限制和有害物质所制定的法定标准。它是基于工作时间强度，如40小时/周，8个小时/天的工作时间。)