So the answer is: the former can isolate air, and the latter can reduce the temperature of combustible materials below the ignition point.

(2) When the electrical appliance is on fire, in order to prevent electric shock, cut off the power supply first, and then put out the fire with a dry powder fire extinguisher. In order to prevent electrical appliances from being damaged, electrical fires cannot be put out with water.

(2) When trapped in a fire area, cover your nose and mouth with a wet towel and crouch or crawl where there is smoke, in order to prevent inhalation of harmful gases generated by burning substances. If you are in a tall building, you can't take the elevator if you go downstairs to escape along the safe passage.

So, the answer is: cover your nose and mouth with a wet towel (squat or crawl where there is smoke; Go downstairs and escape along the safe passage.