A.changes in seawater salinity
B.glare on clouds on the horizon
C.changes in air temperature
D.icebergs
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A.can usually be detected by radar in a smooth sea at a range of 4 to 6 kilometers
B.are indistinguishable from sea return on the PPI
C.are invisible to radar when covered with a thick layer of snow
D.are usually seen at night before they are close enough to provide a radar echo
A.one engine ahead and one engine astern，with full rudder
B.one engine ahead and one engine astern，with rudders amidships
C.both engines ahead，with full rudder
D.both engines astern，with full rudder
A.furnishes support to the rudder，propeller shaft，and transom frame
B.provides foundations for after mooring winches
C.provides foundations for the main propulsion engines
D.transfers the driving force of the propeller to the hull
A.indicated horsepower，bollard pull，and displacement
B.indicated horsepower，maneuverability，and displacement
C.indicated horsepower，bollard pull，and maneuverability
D.bollard pull，displacement，and maneuverability
A.apply enough rudder to counter the effect of the current
B.change your course to a zigzag course
C.reduce your speed
D.shift the weight to the stern
最新試題
In most cases，when a large merchant vessel enters shallow water at high speed the（）.
A vessel which is being assisted by an icebreaker would display a flag hoist consisting of the code numeral 4 when the vessel（）.
A vessel proceeding along the bank of a river or channel has the tendency to（）.
A vessel proceeding along a narrow channel shall（）.
A vessel shall slacken her speed，stop，or reverse her engines，if necessary，to（）.
An alternating light（）.
Any vessel shall，if the circumstances of the case admit，avoid（）in a narrow channel.
On a twin-screw，twin-rudder vessel，the most effective way to turn in your own water，with no way on，is to put（）.
For operations in pack ice，a vessel should（）.
All persons or vessels within the lock area，including the lock approach channels，come under the authority of the（）.