A.precession
B.earth rate
C.gyroscopic inertia
D.gravity effect
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A.remove deviation on the intercardinal headings
B.remove deviation on the cardinal compass headings
C.remove heeling error
D.compensate for induced magnetism in vertical soft iron
A.reduce the variation as much as possible
B.reduce the deviation as much as possible
C.reduce the magnetic dip as much as possible
D.allow the compass bowl to swing freely on its gimbals
A.a collision with another vessel
B.being moored on a constant heading for a long period of time
C.being struck by lightning
D.All of the above
A.being moored for a long time on one heading
B.being struck by lighting
C.steaming from the north magnetic hemisphere to the south magnetic hemisphere
D.loading a homogenous magnetic cargo such as steel plate，iron bars，etc
A.nonmagnetic
B.weatherproof
C.corrosion resistant
D.capable of being permanently affixed to the vessel
最新試題
The line which connects the points of zero magnetic dip is（）.
The Flinders bar on a magnetic compass compensates for the（）.
The Flinders bar and the quadrantal spheres should be tested for permanent magnetism at what interval（）.
What are the only magnetic compass correctors that correct for both permanent and induced effects of magnetism?（）
In more recent years，（）has been used by civilians in many new ways to determine positions，such as in automobile and boat navigation，hiking，emergency rescue，and precision agriculture and mining.
What is the basic principle of the magnetic compass（）.
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（）.
The magnetism in the various structures of a ship changing as a result of cruising，vibration，or aging is termed（）.
When relieving the helm，the new helmsman should know the（）.