When a magnetic compass is not in use for a prolonged period of time it should（）.<br>A:be shielded from direct sunlight<br>B:be locked into a constant heading<br>C:have any air bubbles replaced with nitrogen<br>D:have the compensating magnets removed

When a magnetic compass is not in use for a prolonged period of time it should（）.
A:be shielded from direct sunlight
B:be locked into a constant heading
C:have any air bubbles replaced with nitrogen
D:have the compensating magnets removed

出自：海船船员证

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