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
A vessel proceeding along the bank of a river or channel has the tendency to（）.
An alternating light（）.
A vessel shall slacken her speed，stop，or reverse her engines，if necessary，to（）.
A vessel shall be deemed to be overtaking when she can see at night（）.
Before entering an ice area，the ship should be（）.
A vessel which is being assisted by an icebreaker should indicate that she is ready to cast off the towline by（）.
A vessel showing a rigid replica of the International Code flag A is engaged in（）.
If a tow sinks in shallow water，you should（）.
A vessel reduces speed without backing. The rate that her speed through the water decreases depends primarily on the（）.
In most cases，when a large merchant vessel enters shallow water at high speed the（）.