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。
The exposure in different sits of body surface inroentgenologists was lower than the permissible level.
放射科医生体表各部位的照射量均低于容许水平。
The exposure in different sits of body surface inroentgenologists was lower than the permissible level.
放射科医生体表各部位的照射量均低于容许水平。
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