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

时间:2022-11-02 07:29:42 所属题库:磁罗经与陀螺罗经的使用题库

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