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
单项选择题 If a davit-launched liferaft aboard a ship cannot be launched because of damage to the davit，you should（）.
单项选择题 Horizontal subdivision decks forming watertight compartments in the columns of a semisubmersible ship increase the unit’s（）.
单项选择题 Hanging a barge off means to（）.
