The permanent magnetism of a vessel may change in polarity due to（）.<br>A:being moored for a long time on one heading<br>B:being struck by lighting<br>C:steaming from the north magnetic hemisphere to the south magnetic hemisphere<br>D:loading a homogenous magnetic cargo such as steel plate，iron bars，etc

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

出自：海船船员证

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