单选题When crossing the magnetic equator the（）.AFlinders bar should be invertedBHeeling magnet should be invertedCThe quadrantal spheres should be rotated 180°DFlinders bar should be moved to the opposite side of the binnacle
单选题
When crossing the magnetic equator the（）.
A
Flinders bar should be inverted
B
Heeling magnet should be inverted
C
The quadrantal spheres should be rotated 180°
D
Flinders bar should be moved to the opposite side of the binnacle
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