单项选择题

Control valves of a CO2 system may be located within th……

Control valves of a CO₂ system may be located within the protected space when（）.

A.it is impractical to locate them outside
B.there is also a control valve outside
C.the CO₂ cylinders are also in the space
D.an automatic heat-sensing trip is installed

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单项选择题CO2 cylinders，which protect the small space in which they are stored must（）.

A.NOT contain more than 200 pounds of CO₂
B.be automatically operated by a heat actuator
C.have an audible alarm
D.All of the above

单项选择题CO2 cylinders equipped with pressure actuated discharge heads will discharge automatically when（）.

A.the discharge valve is open
B.the control box glass is broken
C.pressure from the control cylinders is detected
D.the control cylinders have been completely discharged

单项选择题Automatic mechanical ventilation shutdown is required for CO2 systems protecting the（）.

A.machinery spaces
B.cargo compartments
C.living quarters
D.galley

单项选择题An inflatable liferaft should be lifted back aboard the ship by using（）.

A.the single hook at the top of the raft
B.two lines passed under the raft
C.the towing bridle
D.All of the above

单项选择题After using a CO2 extinguisher on a ship，it should be（）.

A.put back in service if some CO₂ remains
B.hydrostatically tested
C.retagged
D.recharged