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граница на допустимо излагане
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。)
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