A.canister-type gas mask
B.fresh-air breathing apparatus
C.self-contained breathing apparatus
D.combustible gas indicator

A.One man report the fire, and the other two men fight the fire
B.One man report the fire, one man fight the fire, and one man evacuate and secure the area
C.One man report the fire, one man fight the fire, and one man act as a safety observer
D.All three men fight the fire and report it immediately after it is extinguished