The magnetism in the various structures of a ship changing as a result of cruising，vibration，or aging is termed（）.<br>A:permanent magnetism<br>B:subpermanent magnetism<br>C:induced magnetism<br>D:variable magnetism

The magnetism in the various structures of a ship changing as a result of cruising，vibration，or aging is termed（）.
A:permanent magnetism
B:subpermanent magnetism
C:induced magnetism
D:variable magnetism

出自：海船船员证

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