The magnetism in the various structures of a ship changing as a result of cruising，vibration，or aging is termed（）.
- Apermanent magnetism
- Bsubpermanent magnetism
- Cinduced magnetism
- Dvariable magnetism
问题
The magnetism in the various structure
参考解析：
分类：磁罗经与陀螺罗经的使用题库
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