单项选择题
If a port is in fact unsafe，it（）irrelevant that well-informed men might have erroneously pronounced it to be safe.
A.provides
B.has
C.contains
D.is
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If a davit-launched liferaft aboard a ship cannot be launched because of damage to the davit，you should（）.
A.inflate the liferaft on deck
B.roll the liferaft over the side
C.go to another liferaft station
D.get a saw and cut the liferaft free -
单项选择题
Horizontal subdivision decks forming watertight compartments in the columns of a semisubmersible ship increase the unit’s（）.
A.tank capacities
B.stability in the event of damage
C.towing speed
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单项选择题
Hanging a barge off means to（）.
A.moor a damaged barge to the bank and leave
B.remove and deliver a loaded barge from a multiple tow
C.remove a barge while locking through
D.tow an empty barge astern
