関連ワード:  is fuel flammable or combustible    is gasoline flammable or combustible    is gas flammable or combustible    is petrol flammable or combustible    is diesel fuel flammable or combustible    is jet fuel flammable or combustible    is fuel oil flammable or combustible    is natural gas flammable or combustible    is cs gas flammable or combustible    is gasoline a flammable or combustible liquid