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
What are the only magnetic compass correctors that correct for both permanent and induced effects of magnetism?（）
When adjusting a magnetic compass using the fore-and-aft permanent magnets，you should（）.
What is the basic principle of the magnetic compass（）.
The Flinders bar on a magnetic compass compensates for the（）.
Variation is the angular measurement between（）.
The magnetism in the various structures of a ship changing as a result of cruising，vibration，or aging is termed（）.
A ship under construction or major repair will acquire permanent magnetism due to（）while sitting stationary in the earth’s magnetic field.
What is the basic principle of the magnetic compass?（）
What is an advantage of the magnetic compass aboard vessels?（）
Variation in a compass is caused by（）.