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
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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
A.maneuverability will increase
B.speed will increase
C.bow will squat farther than the stern
D.vessel will rise slightly，on a level plane
A.The towing line between the two vessels should be clear of the water
B.The towing line should be taut at all times between the vessels
C.There should be a catenary so the line dips into the water
D.None of the above
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A vessel proceeding along a narrow channel shall（）.
Topside icing decreases vessel stability because it is usually off-center and（）.
Ice blink is（）.
A towing vessel should be on the crest of a wave at the same time as its tow and in the trough at the same time. The term used to describe this is（）.
In selecting a tug for moving a vessel，consideration should be given to its（）.
Small floes of rough，hummocky sea ice capable of damaging a vessel（）.
A vessel shall slacken her speed，stop，or reverse her engines，if necessary，to（）.
A vessel showing a rigid replica of the International Code flag A is engaged in（）.
A vessel which is being assisted by an icebreaker should indicate that she is ready to cast off the towline by（）.
In most cases，when a large merchant vessel enters shallow water at high speed the（）.