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
The MOST important feature of the material used for making the binnacle of a standard magnetic compass is that it is（）.
Which statement about the Flinders bar of the magnetic compass is CORRECT（）.
Which statement about the gyrocompass is FALSE（）.
What is the basic principle of the magnetic compass（）.
When changing from a compass course to a true course you should apply（）.
When crossing the magnetic equator the（）.
The magnetism in the various structures of a ship changing as a result of cruising，vibration，or aging is termed（）.
The line which connects the points of zero magnetic dip is（）.
What are the only magnetic compass correctors that correct for both permanent and induced effects of magnetism?（）
Which magnetic compass corrector（s）can be set while the vessel is on a heading of magnetic north or magnetic south（）.