Error may be introduced into a magnetic compass by（）.<br>A:making a structural change to the vessel<br>B:a short circuit near the compass<br>C:belt buckles<br>D:All of the above

Error may be introduced into a magnetic compass by（）.
A:making a structural change to the vessel
B:a short circuit near the compass
C:belt buckles
D:All of the above

出自：海船船员证

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