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

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

出自：海船船员证

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