A.displacement
B.free surface
C.draft
D.KG
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A.increases displacement
B.increases the height of the center of gravity
C.increases draft
D.reduces the pocketing of free surface
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
最新試題
When pushing ahead，wires leading from the quarters of the after outboard barges to the bow of a towboat（）.
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 shall be deemed to be overtaking when she can see at night（）.
On a single-screw vessel the stern frame（）.
Any vessel shall，if the circumstances of the case admit，avoid（）in a narrow channel.
A vessel showing a rigid replica of the International Code flag A is engaged in（）.
For operations in pack ice，a vessel should（）.
A vessel which is being assisted by an icebreaker should indicate that she is ready to cast off the towline by（）.
Topside icing that blocks freeing ports and scuppers（）.
In selecting a tug for moving a vessel，consideration should be given to its（）.