The necessity for administering artificial respiration may be recognized by the victims （）.

A.Commence draining that tank as quickly as possible
B.Seal off all vents to that tank
C.Activate the CO₂ system to that tank
D.Shut off the steam heating coils

A.secure all openings to the tank
B.discharge an initial charge of CO₂ with a hand portable extinguisher
C.direct a fire hose into the tank and energize the fire main
D.spray the tank boundaries with a fire hose to promote cooling

A.secure all sources of fresh air to the tank
B.begin transferring the fuel to other tanks
C.top off the tank to force out all vapors
D.station someone at the fixed CO₂ release controls