單項選擇題The collision bulkhead shall be of（）.
A.water-tight
B.air-tight
C.fire-tight
D.oil-tight
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1.單項選擇題The damage arose（）the accident.
A.against
B.of
C.for
D.from
2.單項選擇題The disinfection of various compartments in a vessel by filling with a gaseous agent to destroy rats and all insects pests which act as germ carriers means（）.
A.displacement
B.fumigation
C.discharging
D.compensation
