A.They are not subject to permanent magnetism; no check is necessary
B.Semiannually
C.Annually
D.Every five years
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A.Induced magnetism in vertical soft iron
B.Induced magnetism in horizontal soft iron
C.Permanent magnetism in ship's steel
D.Vessel's inclination from the vertical
A.GPS
B.GMDSS
C.AIS
D.Navtex
A.Black
B.Blue
C.Red
D.White
A.flux
B.poles
C.magnets
D.azimuth
A.If the blue ends of the magnets are aft，and the fore-and-aft tray is at the top，you should add some magnets
B.If the blue ends of the magnets are aft you should lower the fore-and-aft tray
C.If the blue ends of the magnets are aft，and the fore-and-aft tray is at the top，you should reverse the magnets
D.If the blue ends of the magnets are forward，and the fore-and-aft tray is at the bottom，you should add some magnets
最新試題
Variation in a compass is caused by（）.
What is used to correct for both induced and permanent magnetism，and consequently must be readjusted with radical changes in latitude（）.
The Flinders bar and the quadrantal spheres should be tested for permanent magnetism at what interval（）.
The MOST important feature of the material used for making the binnacle of a standard magnetic compass is that it is（）.
What are the only magnetic compass correctors that correct for both permanent and induced effects of magnetism?（）
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.
Which statement about the gyrocompass is FALSE（）.
When a magnetic compass is not in use for a prolonged period of time it should（）.
A ship under construction or major repair will acquire permanent magnetism due to（）while sitting stationary in the earth’s magnetic field.
Which statement about the Flinders bar of the magnetic compass is CORRECT（）.