When should a fire be ventilated?()
Hygroscopic cargoes should be ventilated when().
Storage batteries should be charged in a well ventilated area because().
A space should be ventilated when().
Storage batteries should be charged in a well ventilated area because().
Hygroscopic cargoes should be ventilated when().
Hygroscopic cargoes should be ventilated when().
A fire must be ventilated().