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
On a twin-screw，twin-rudder vessel，the most effective way to turn in your own water，with no way on，is to put（）.
On a single-screw vessel the stern frame（）.
For operations in pack ice，a vessel should（）.
Two vessels are abreast of each other and passing port to port in a confined waterway. What should you expect as your bow approaches the screws of the other vessel? （）
A vessel proceeding along a narrow channel shall（）.
All persons or vessels within the lock area，including the lock approach channels，come under the authority of the（）.
A vessel proceeding along the course of a narrow channel or fairway shall keep as near to the （）limit of the channel or fairway which lies on her（）side as is safe and practicable.
Topside icing decreases vessel stability becauseit increases（）.
Ice blink is（）.
Topside icing that blocks freeing ports and scuppers（）.