单选题What are the only magnetic compass correctors that correct for both permanent and induced effects of magnetism?（）AQuadrantal spheresBHeeling magnetsCAthwartships magnetsDFore-and-aft magnets
单选题
What are the only magnetic compass correctors that correct for both permanent and induced effects of magnetism?（）
A
Quadrantal spheres
B
Heeling magnets
C
Athwartships magnets
D
Fore-and-aft magnets
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