Variation in a compass is caused by（）.<br>A:Worn gears in the compass housing<br>B:Magnetism from the earth's magnetic field<br>C:Magnetism within the vessel<br>D:Lack of oil in the compass bearings

Variation in a compass is caused by（）.
A:Worn gears in the compass housing
B:Magnetism from the earth's magnetic field
C:Magnetism within the vessel
D:Lack of oil in the compass bearings

出自：海船船员证

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