Deck : General Navigation - 665/2138
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| Permanent magnetism is caused by __________. |
| A) the vertical component of the earth's magnetic field acting on the vertical soft iron |
| B) the horizontal component of the earth's magnetic field acting on the horizontal soft iron |
| C) operation of electrical equipment and generators on board ship |
| D) the earth's magnetic field affecting the ship's hard iron during construction |
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