When a magnetic compass is not in use for a prolonged period of time it should（）.
- Abe shielded from direct sunlight
- Bbe locked into a constant heading
- Chave any air bubbles replaced with nitrogen
- Dhave the compensating magnets removed
问题
When a magnetic compass is not in use
参考解析：
分类：磁罗经与陀螺罗经的使用题库
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