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 for error，a deviation table should be made（）.
What is the basic principle of the magnetic compass?（）
This induced magnetism（）the permanent magnetism already present in the ship.
The Flinders bar and the quadrantal spheres should be tested for permanent magnetism at what interval（）.
In more recent years，（）has been used by civilians in many new ways to determine positions，such as in automobile and boat navigation，hiking，emergency rescue，and precision agriculture and mining.
The MOST important feature of the material used for making the binnacle of a standard magnetic compass is that it is（）.
Variation is the angular measurement between（）.
Variation in a compass is caused by（）.
Which statement about the Flinders bar of the magnetic compass is CORRECT（）.
When crossing the magnetic equator the（）.