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
The Flinders bar and the quadrantal spheres should be tested for permanent magnetism at what interval（）.
When a magnetic compass is not in use for a prolonged period of time it should（）.
While in drydock your vessel will be belt-gauged.This process involves（）.
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（）.
Variation is the angular measurement between（）.
The line which connects the points of zero magnetic dip is（）.
The most accurate method of determining gyrocompass error while underway is by（）.
What is used to correct for both induced and permanent magnetism，and consequently must be readjusted with radical changes in latitude（）.
The MOST important feature of the material used for making the binnacle of a standard magnetic compass is that it is（）.