单选题The magnetism in the various structures of a ship changing as a result of cruising，vibration，or aging is termed（）.Apermanent magnetismBsubpermanent magnetismCinduced magnetismDvariable magnetism
单选题
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
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