单选题Magnets are placed in horizontal trays in the compass binnacle to compensate for the（）.Ainduced magnetism in the vessel's horizontal soft ironBchange in the magnetic field when the vessel inclines from verticalCpermanent magnetism of the vesselDmagnetic fields caused by electrical currents in the vicinity
单选题
Magnets are placed in horizontal trays in the compass binnacle to compensate for the（）.
A
induced magnetism in the vessel's horizontal soft iron
B
change in the magnetic field when the vessel inclines from vertical
C
permanent magnetism of the vessel
D
magnetic fields caused by electrical currents in the vicinity
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