单项选择题
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
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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 -
单项选择题
Records of tests and inspections of a cargo vessel’s fire extinguishing systems shall be（）on board until the vessel’s Certificate of Inspection expires.
A.consealed
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C.contained
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Accumulations of oily rags should be（）.
A.kept in nonmetal containers
B.discarded as soon as possible
C.cleaned thoroughly for reuse
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