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

单项选择题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
B.detained
C.contained
D.kept

单项选择题Accumulations of oily rags should be（）.

A.kept in nonmetal containers
B.discarded as soon as possible
C.cleaned thoroughly for reuse
D.kept in the paint locker