单选题When a magnetic compass is not in use for a prolonged period of time it should（）.Abe shielded from direct sunlightBbe locked into a constant headingChave any air bubbles replaced with nitrogenDhave the compensating magnets removed
单选题
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
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