單項選擇題

The permanent magnetism of a vessel may change in strength due to（）.

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

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單項選擇題

The permanent magnetism of a vessel may change in polarity due to（）.

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

單項選擇題

The MOST important feature of the material used for making the binnacle of a standard magnetic compass is that it is（）.

A.nonmagnetic
B.weatherproof
C.corrosion resistant
D.capable of being permanently affixed to the vessel