A.permanent magnetism
B.subpermanent magnetism
C.induced magnetism
D.variable magnetism
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A.An agonic line
B.The magnetic equator
C.A magnetic meridian
D.All of the above
A.They are not subject to permanent magnetism; no check is necessary
B.Semiannually
C.Annually
D.Every five years
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
最新試題
When a magnetic compass is not in use for a prolonged period of time it should（）.
The MOST important feature of the material used for making the binnacle of a standard magnetic compass is that it is（）.
While in drydock your vessel will be belt-gauged.This process involves（）.
What is used to correct for both induced and permanent magnetism，and consequently must be readjusted with radical changes in latitude（）.
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.
What is the basic principle of the magnetic compass（）.
What are the only magnetic compass correctors that correct for both permanent and induced effects of magnetism?（）
The Flinders bar and the quadrantal spheres should be tested for permanent magnetism at what interval（）.
Which compensates for errors introduced when the vessel heels over（）.
The most accurate method of determining gyrocompass error while underway is by（）.