单选题Variation in a compass is caused by（）.Aworn gears in the compass housingBmagnetism from the earth's magnetic fieldCmagnetism within the vesselDlack of oil in the compass bearings
单选题
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
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