Deviation in a compass is caused by the（）.<br>A:vessel's geographic position<br>B:vessel's heading<br>C:earth's magnetic field<br>D:influence of the magnetic materials of the vessel

Deviation in a compass is caused by the（）.
A:vessel's geographic position
B:vessel's heading
C:earth's magnetic field
D:influence of the magnetic materials of the vessel

出自：海船船员证

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