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单选题
The directive force of a gyrocompass（）.
A
increases with latitude，being maximum at the geographic poles
B
decreases with latitude，being maximum at the geographic equator
C
is greatest when a vessel is near the Earth's magnetic equator
D
remains the same at all latitudes
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increases with latitude，being maximum at the geographic polesB
decreases with latitude，being maximum at the geographic equatorC
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remains the same at all latitudes
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The chronometerC
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difference in the buoyant force in salt and fresh waters
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