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
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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
A.like magnetic poles attract
B.unlike magnetic poles repel
C.unlike poles attract
D.the poles of the compass line up with the geographic poles of the earth
A.north magnetic pole
B.south magnetic pole
C.magnetic prime vertical meridian
D.magnetic equator
最新試題
What is the name of the movable，radial guide line used to measure direction on a radar?（）
This induced magnetism（）the permanent magnetism already present in the ship.
When relieving the helm，the new helmsman should know the（）.
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 are the only magnetic compass correctors that correct for both permanent and induced effects of magnetism?（）
The most accurate method of determining gyrocompass error while underway is by（）.
The variation for most given areas undergoes（）change，the amount of which is also noted on charts.
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（）.
Which magnetic compass corrector（s）CANNOT be set on a heading of magnetic east or magnetic west（）.