單項(xiàng)選擇題High clouds，composed of small white flakes or scaly globular masses，and often banded together to form a “mackerel sky”，would be classified as（）.

A.cirrus
B.cirrocumulus
C.altostratus
D.cumulonimbus


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1.單項(xiàng)選擇題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

2.單項(xiàng)選擇題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

3.單項(xiàng)選擇題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

4.單項(xiàng)選擇題Guide tolerances during elevation of the jack-up rig will（）.

A.reduce spud can bearing pressure
B.keep the unit level and reduce overloading
C.reduce stresses on the hull
D.minimize the potential for punch-through

5.單項(xiàng)選擇題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