A.smoke sensorsB.the difference in thermal expansion of……

单项选择题Except in rare cases，it is impossible to extinguish a shipboard fire by（）.

A.removing the heat
B.removing the oxygen
C.removing the fuel
D.interrupting the chain reaction

单项选择题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

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