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 relieving the helm，the new helmsman should know the（）.
The variation for most given areas undergoes（）change，the amount of which is also noted on charts.
When a vessel changes course from one cardinal heading to another cardinal heading whilea djusting the compass，which action should be taken?（）
A ship under construction or major repair will acquire permanent magnetism due to（）while sitting stationary in the earth’s magnetic field.
Variation is a compass error that you（）.
Any piece of metal on becoming magnetized will develop regions of concentrated magnetism called（）.
When adjusting a magnetic compass using the fore-and-aft permanent magnets，you should（）.
The Flinders bar and the quadrantal spheres should be tested for permanent magnetism at what interval（）.
The line which connects the points of zero magnetic dip is（）.
By convention，the north seeking ends of a compass’ magnets are colored（）.