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a confined space is any space with limited openings for entry and exit and unfavourable natural ventilation which could contain or produce dangerous air contaminants.
58. 狭窄空间是指任何进出口十分狭窄和自然空气不通畅的空间;而且其中可能会藏匿危险废物或储存着可产生危险的空气污染物。