This induced magnetism（）the permanent magnetism already present in the ship.<br>A:will add to<br>B:will subtract from<br>C:may add to or subtract from<br>D:will not change

This induced magnetism（）the permanent magnetism already present in the ship.
A:will add to
B:will subtract from
C:may add to or subtract from
D:will not change

出自：海船船员证

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