单选题The permanent magnetism of a vessel may change in polarity due to（）.Abeing moored for a long time on one headingBbeing struck by lightingCsteaming from the north magnetic hemisphere to the south magnetic hemisphereDloading a homogenous magnetic cargo such as steel plate，iron bars，etc
单选题
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
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