单选题Which magnetic compass corrector（s）can be set while the vessel is on a heading of magnetic north or magnetic south（）.AQuadrantal spheresBHeeling magnetsCFlinders barDFore-and-aft magnets
单选题
Which magnetic compass corrector（s）can be set while the vessel is on a heading of magnetic north or magnetic south（）.
A
Quadrantal spheres
B
Heeling magnets
C
Flinders bar
D
Fore-and-aft magnets
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解析：
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