A.three shapes，the highest and lowest shall be red balls，and the middle shall be a white diamond
B.two black balls
C.three shapes; the highest and lowest shall be black balls，and the middle shall be a red diamond
D.three shapes; the highest and lowest shall be black balls and the middle shall be a black diamond
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A.two balls in a vertical line
B.two diamonds in a vertical line
C.a single black ball
D.no shape is shown during the day
A.injured is unfit for duty
B.injured is able to return to work
C.injury results in loss of life only
D.injury is the result of misconduct
A.all mooring lines have a different tension
B.the leeward lines have higher tension than the windward lines
C.the maximum tension of the most heavily loaded line does not exceed the safe working load
D.all horizontal tension forces on the windward lines are no greater than the vertical tension forces
A.The designated person in charge
B.The tankerman
C.The senior able seaman
D.The oiler
A.buoyancy
B.extra storage space
C.additional tank capacity
D.reduced stability
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Fire dampers prevent the spread of fire by（）.
Fittings used for towing must be（）.
Each EPIRB required on an OSV shall be tested using the integrated test circuit and output indicator every（）.
Fire protection and manning regulations for towing vessels state that the Master or person in charge must ensure that all crew members who have not participated in the drills or received the safety orientation（）.
During the winter months，the southeast trade winds are（）.
Each life preserver must be readily accessible to the person for whom it is intended while he or she is（）.
During oil transfer operations，who is responsible for ensuring that the posted transfer procedures are followed?（）
Fighting a rig fire in a watertight compartment with hoses could reduce the stability of the rig by（）.
Each OSV must carry（）.
Each fire hose coupling on a ship must have threads that meet the specifications of the（）.