The permanent magnetism of a vessel may change in strength due to（）.<br>A:the nature of the cargo being carried<br>B:changes in heading<br>C:major structural repair<br>D:All of the above

The permanent magnetism of a vessel may change in strength due to（）.
A:the nature of the cargo being carried
B:changes in heading
C:major structural repair
D:All of the above

出自：海船船员证

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