Variation is a compass error that you（）.
- Acan correct by adjusting the compass card
- Bcan correct by adjusting the compensating magnets
- Ccan correct by changing the vessel's heading
- Dcannot correct
问题
Variation is a compass error that you（
参考解析：
分类：磁罗经与陀螺罗经的使用题库
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