Question 12 - Dry sand is used on ____ fires.
Question 13 - ____ is/are the most common fire-extinguishing agent(s) in use today.
Question 14 - The ____ smoke detector contains a small amount of radioactive material to detect smoke.
Question 15 - ____ have characteristics of halogenated agents, but do not harm the ozone layer.
Question 16 - In a preaction system the sprinkler heads are ____.