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（）.
Before entering an ice area，the ship should be（）.
On a twin-screw，twin-rudder vessel，the most effective way to turn in your own water，with no way on，is to put（）.
In most cases，when a large merchant vessel enters shallow water at high speed the（）.
If a tow sinks in shallow water，you should（）.
A tug’s horsepower available at the shaft is（）.
Topside icing that blocks freeing ports and scuppers（）.
Any vessel shall，if the circumstances of the case admit，avoid（）in a narrow channel.
A vessel proceeding along the bank of a river or channel has the tendency to（）.
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（）.