单项选择题
Frapping lines（）.
A.secure the lifeboat in the davits when in the stowed position
B.bring the lifeboat close alongside the rail in the embarkation position
C.give the occupants a safety line when the boat is being lowered from the embarkation level
D.reduce the swinging of the lifeboat at the embarkation level
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Forty-five fathoms is marked on the anchor chain by（）.
A.one turn of wire on the first stud from each side of the detachable link
B.two turns of wire on the second stud from each side of the detachable link
C.three turns of wire on the third stud from each side of the detachable link
D.four turns of wire on the fourth stud from each side of the detachable link -
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Forces within a drilling unit have caused a difference between the starboard and port drafts. This difference is（）.
A.list
B.heel
C.trim
D.flotation -
单项选择题
For the purpose of training and drills，if reasonable and practicable，rescue boats on an OSV must be launched with their assigned crew（）.
A.once a week
B.once a month
C.once a year
D.twice a year
