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单选题
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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Release gripes，lift brake，release tricing pennants
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