A.increases displacement
B.increases the height of the center of gravity
C.increases draft
D.reduces the pocketing of free surface
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A.changes in seawater salinity
B.glare on clouds on the horizon
C.changes in air temperature
D.icebergs
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
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A tug’s horsepower available at the shaft is（）.
An alternating light（）.
A vessel the passage of which is not to be impeded（）to comply with this Rule when the two vessels are approaching one another so as to involve risk of collision.
As the weather was worsening and wind force rising to 8，my vessel（）were yawing within forty degrees of the compass.
Small floes of rough，hummocky sea ice capable of damaging a vessel（）.
Topside icing decreases vessel stability because it is usually off-center and（）.
In selecting a tug for moving a vessel，consideration should be given to its（）.
In order to reduce your wake in a narrow channel you should（）.
A vessel shall slacken her speed，stop，or reverse her engines，if necessary，to（）.
All persons or vessels within the lock area，including the lock approach channels，come under the authority of the（）.