The vertical component of the Earth’s magnetic field causes induced magnetism in vertical soft iron. This changes with latitude. What corrects for this coefficient of the deviation? （）<br>A:The Flinders bar<br>B:The heeling magnet<br>C:Quadrantal soft iron spheres<br>D:Bar magnets in the binnacle

The vertical component of the Earth’s magnetic field causes induced magnetism in vertical soft iron. This changes with latitude. What corrects for this coefficient of the deviation? （）
A:The Flinders bar
B:The heeling magnet
C:Quadrantal soft iron spheres
D:Bar magnets in the binnacle

出自：海船船员证

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