A ship under construction or major repair will acquire permanent magnetism due to（）while sitting stationary in the earth’s magnetic field.<br>A:hammering and jarring<br>B:vibration and pounding<br>C:varying magnetic fields<br>D:stable or permanent magnetism of the ship

A ship under construction or major repair will acquire permanent magnetism due to（）while sitting stationary in the earth’s magnetic field.
A:hammering and jarring
B:vibration and pounding
C:varying magnetic fields
D:stable or permanent magnetism of the ship

出自：海船船员证

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