A.measuring the thickness of the tail shaft liner
B.taking the vessel's offsets to check for hull deformation
C.testing and examining the anchor cables for defective links
D.drilling or sonic-testing the hull to determine the plate thickness
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A.Its accuracy remains the same at all latitudes
B.It seeks the true meridian
C.It can be used near the Earth's magnetic poles
D.If an error exists，it is the same on all headings
A.It compensates for the error caused by the vertical component of the Earth's magnetic field
B.It compensates for error caused by the heeling of a vessel
C.It compensates for quadrantal deviation
D.It is only needed in equatorial waters
A.Heeling magnet
B.Flinders bar
C.Fore-and-aft magnets
D.All of the above can be set on magnetic east or magnetic west headings
A.Quadrantal spheres
B.Heeling magnets
C.Flinders bar
D.Fore-and-aft magnets
A.The soft iron spheres on the arms of the binnacle
B.Magnets placed in trays inside the binnacle
C.A single vertical magnet beneath the compass
D.The Flinders bar
最新試題
When adjusting a magnetic compass using the fore-and-aft permanent magnets，you should（）.
The Flinders bar on a magnetic compass compensates for the（）.
A ship under construction or major repair will acquire permanent magnetism due to（）while sitting stationary in the earth’s magnetic field.
Variation is a compass error that you（）.
The line which connects the points of zero magnetic dip is（）.
When a magnetic compass is not in use for a prolonged period of time it should（）.
By convention，the north seeking ends of a compass’ magnets are colored（）.
When adjusting a magnetic compass for error，a deviation table should be made（）.
Which compensates for errors introduced when the vessel heels over（）.
Which statement about the Flinders bar of the magnetic compass is CORRECT（）.