单选题
发布日期:2021-03-22
permanent magnetism
subpermanent magnetism
induced magnetism
variable magnetism
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This induced magnetism()the permanent magnetism already present in the ship.
Permanent magnetism is caused by().
Permanent magnetism is found in().
Induced magnetism is found in().
The permanent magnetism of a vessel may change in strength due to().
The permanent magnetism of a vessel may change in strength due to().
The permanent magnetism of a vessel may change in polarity due to().