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
When changing from a compass course to a true course you should apply（）.
What is the basic principle of the magnetic compass（）.
The quadrantal spheres are used to（）.
The magnetism in the various structures of a ship changing as a result of cruising，vibration，or aging is termed（）.
While in drydock your vessel will be belt-gauged.This process involves（）.
The Flinders bar on a magnetic compass compensates for the（）.
What is the name of the movable，radial guide line used to measure direction on a radar?（）
The line which connects the points of zero magnetic dip is（）.
What is an advantage of the magnetic compass aboard vessels?（）
The variation for most given areas undergoes（）change，the amount of which is also noted on charts.