A.An agonic line
B.The magnetic equator
C.A magnetic meridian
D.All of the above
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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
A.flux
B.poles
C.magnets
D.azimuth
最新試題
Variation is a compass error that you（）.
Which compensates for errors introduced when the vessel heels over（）.
What is used to correct for both induced and permanent magnetism，and consequently must be readjusted with radical changes in latitude（）.
Any piece of metal on becoming magnetized will develop regions of concentrated magnetism called（）.
When relieving the helm，the new helmsman should know the（）.
The line which connects the points of zero magnetic dip is（）.
When adjusting a magnetic compass for error，a deviation table should be made（）.
When adjusting a magnetic compass using the fore-and-aft permanent magnets，you should（）.
When crossing the magnetic equator the（）.
When a magnetic compass is not in use for a prolonged period of time it should（）.