单项选择题

A portable dry chemical fire extinguisher discharges by（）.

A.gravity when the extinguisher is turned upside down
B.pressure from a small CO₂ cartridge on the extinguisher
C.air pressure from the hand pump attached to the extinguisher
D.pressure from the reaction when water is mixed with the chemical

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单项选择题A passenger vessel is required to have a supervised patrol when（）.

A.there are passengers berthed on board
B.navigating in excess of eight hours
C.the vessel has substantial wood in its construction
D.there is no automatic fire-detection system installed

单项选择题A marine chemist issues gas free certificates and is certified by the（）.

A.Mine Safety Appliance Association
B.American Chemical Society
C.Marine Chemists Association
D.National Fire Protection Association

单项选择题A large oil fire on the deck of a ship can be fought most effectively with（）.

A.dry chemical
B.foam
C.high-velocity fog
D.Water (cartridge-operated)

单项选择题A GROUP OF CREW MEMBERS TRAINED FOR FIGHTING FLOODING IN THE VESSEL are known as（）.

A.Fire party
B.Deck cadets
C.Research team
D.Damage control team

单项选择题A galley grease fire on the stove may be extinguished using（）.

A.water
B.foam
C.the range hood extinguishing system
D.fire dampers