问题
单项选择题
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
答案
参考答案：C
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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
参考答案：C