A.is usually below the center of gravity and has little effecton stability
B.will cause water on deck to pocket and increase stability
C.may decrease stability by increasing free surface effect due to water on deck
D.increases the effective freeboard and increases thewind-heel affect
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A.displacement
B.free surface
C.draft
D.KG
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
最新試題
When operating in an area where sea ice and icebergs are present，which statement is TRUE? （）
A vessel proceeding along the bank of a river or channel has the tendency to（）.
When pushing ahead，wires leading from the quarters of the after outboard barges to the bow of a towboat（）.
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 selecting a tug for moving a vessel，consideration should be given to its（）.
For operations in pack ice，a vessel should（）.
Before entering an ice area，the ship should be（）.
If a tow sinks in shallow water，you should（）.
All persons or vessels within the lock area，including the lock approach channels，come under the authority of the（）.
Small floes of rough，hummocky sea ice capable of damaging a vessel（）.