A.are made of bronze，brass，or soft alloy metals
B.should be painted red in order to identify hose lengths
C.are specially hardened to prevent crushing
D.should be greased frequently

A.4Certificate of Inspection
B.Certificate of Seaworthiness
C.Classification Certificate
D.Certificate of Registry

A.able to absorb heat
B.water based
C.nonconducting
D.nontoxic

A.used for electrical fires only
B.the smallest
C.the most accessible
D.the most effective

A.portable
B.semi-portable
C.fixed
D.disposable

A.crewman's duty list
B.Certificate of Inspection
C.shipping articles
D.muster list

A.smoke sensors
B.the difference in thermal expansion of two dissimilar metals
C.pressure loss due to air being heated
D.an electric eye which actuates when smoke interferes with the beam

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

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

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

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