单选题If the compass heading and the magnetic heading are the same then（）.Athe deviation has been offset by the variationBthere is something wrong with the compassCthe compass is being influenced by nearby metalsDthere is no deviation on that heading
单选题
If the compass heading and the magnetic heading are the same then（）.
A
the deviation has been offset by the variation
B
there is something wrong with the compass
C
the compass is being influenced by nearby metals
D
there is no deviation on that heading
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