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
A vessel proceeding along the course of a narrow channel shall keep as near to the outer limitof the channel which lies on her starboard side as it is safe and practicable.Which one of the followings does the statement express?（）.
A vessel proceeding along a narrow channel shall（）.
An alternating light（）.
On a single-screw vessel the stern frame（）.
A vessel proceeding along the bank of a river or channel has the tendency to（）.
The proximity of pack ice may be indicated by（）.
Ice blink is（）.
When operating in an area where sea ice and icebergs are present，which statement is TRUE? （）
A vessel reduces speed without backing. The rate that her speed through the water decreases depends primarily on the（）.
When pushing ahead，wires leading from the quarters of the after outboard barges to the bow of a towboat（）.