单选题A single vertical magnet placed underneath the compass in the binnacle is used to compensate for（）.Athe horizontal component of the permanent magnetismBdeviation caused by the vessel's inclination from the verticalCinduced magnetism in the horizontal soft ironDinduced magnetism in the vertical soft iron
单选题
A single vertical magnet placed underneath the compass in the binnacle is used to compensate for（）.
A
the horizontal component of the permanent magnetism
B
deviation caused by the vessel's inclination from the vertical
C
induced magnetism in the horizontal soft iron
D
induced magnetism in the vertical soft iron
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