单项选择题
Handholds or straps on the underside of an inflatable liferaft are provided（）.
A.to right the raft if it capsizes
B.to carry the raft around on deck
C.for crewmen to hang on to
D.to hang the raft for drying
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Halon fire extinguishers are NOT effective when used on which types of fires?（）
A.Fires in electrical equipment
B.Flammable oils and greases
C.Class "A" fires in ordinary combustibles
D.Materials containing their own oxygen -
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Guide tolerances during elevation of the jack-up rig will（）.
A.reduce spud can bearing pressure
B.keep the unit level and reduce overloading
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D.minimize the potential for punch-through -
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Great Salt Pond on Block Island is（）.
A.entered through a dredged cut
B.not accessible in easterly gales
C.available for vessels up to a maximum draft of 8 feet (2.4m)
D.not affected by the tide
