The permanent magnetism of a vessel may change in strength due to（）.<br>A:a collision with another vessel<br>B:being moored on a constant heading for a long period of time<br>C:being struck by lightning<br>D:All of the above

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

出自：海船船员证

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