Magnets in the binnacles of magnetic compasses are used to reduce the effect of（）.<br>A:deviation<br>B:variation<br>C:local attraction<br>D:All of the above

Magnets in the binnacles of magnetic compasses are used to reduce the effect of（）.
A:deviation
B:variation
C:local attraction
D:All of the above

出自：海船船员证

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