单选题When using the lifeboat compass，you must be careful to（）.Aset it on the centerline of the boatBapply the correction for compass errorCkeep metal objects away from itDAll of the above
单选题
When using the lifeboat compass，you must be careful to（）.
A
set it on the centerline of the boat
B
apply the correction for compass error
C
keep metal objects away from it
D
All of the above
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