Permanent magnetism is caused by（）.<br>A:operation of electrical equipment and generators on board ship<br>B:the earth's magnetic field affecting the ship's hard iron during construction<br>C:the horizontal component of the earth's magnetic field acting on the horizontal soft iron<br>D:the vertical component of the earth's magnetic field acting on the vertical soft iron

Permanent magnetism is caused by（）.
A:operation of electrical equipment and generators on board ship
B:the earth's magnetic field affecting the ship's hard iron during construction
C:the horizontal component of the earth's magnetic field acting on the horizontal soft iron
D:the vertical component of the earth's magnetic field acting on the vertical soft iron

出自：海船船员证

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