Variation is a compass error that you（）.<br>A:can correct by adjusting the compass card<br>B:can correct by adjusting the compensating magnets<br>C:can correct by changing the vessel's heading<br>D:cannot correct

Variation is a compass error that you（）.
A:can correct by adjusting the compass card
B:can correct by adjusting the compensating magnets
C:can correct by changing the vessel's heading
D:cannot correct

出自：海船船员证

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