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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Each drilling unit equipped with helicopter fuel storage tanks must have the tanks installed as far as practicable from the（）.
Fire extinguishers used on ship’s are numbered by size I through V，with I being（）.
Fire dampers prevent the spread of fire by（）.
Each OSV must carry（）.
During the winter months，the southeast trade winds are（）.
Fire protection regulations for towing vessels allow all of these types of fuel piping，EXCEPT（）.
Fire protection regulations for towing vessels require any fuel line subject to internal head pressure from fuel in the tank to（）.
Fire protection regulations apply to those towing vessels（）.
Fighting a rig fire in a watertight compartment with hoses could reduce the stability of the rig by（）.
During the course of a voyage，a seaman falls on the main deck and injures his ankle. The Master should submit a Report of Marine Accident，Injury or Death if the（）.