單項選擇題After each reading of an oxygen indicator，the instrument should be purged with（）.

A.CO2
B.fresh air
C.the tested compartment's air
D.water


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1.單項選擇題Actuating the CO2 fixed system causes the shutdown of the（）.

A.fuel supply
B.exhaust ventilation
C.supply and exhaust ventilation
D.mechanical and natural ventilation

2.單項選擇題A safety outlet is provided on the CO2 discharge piping to prevent（）.

A.over pressurization of the space being flooded
B.rupture of cylinder due to temperature increase
C.over pressurization of the CO2 discharge piping
D.flooding of a space where personnel are present

3.單項選擇題A fire in the galley ALWAYS poses the additional threat of（）.

A.contaminating food with extinguishing agent
B.spreading through the engineering space
C.causing loss of stability
D.a grease fire in the ventilation system

4.單項選擇題A fire in a ballast pumproom can be brought under control with minimal impact on stability by（）.

A.cooling the outside bulkheads with water
B.shutting all sources of air into the compartment
C.closing the sea chest
D.flooding the compartment with salt water

5.單項選擇題A fifteen-pound CO2 extinguisher（）.

A.contains 15 pounds of CO2
B.weighs 15 pounds when full of CO2
C.has 15 pounds of pressure at the nozzle
D.weighs 15 pounds when empty