Before a magnetic compass is adjusted certain correctors must be checked to ensure that they are free of permanent magnetism. These correctors are the（）.<br>A:fore-and-aft and athwartships magnets<br>B:dip needle and heeling magnet<br>C:heeling magnet and Flinders bar<br>D:Flinders bar and quadrantal spheres

Before a magnetic compass is adjusted certain correctors must be checked to ensure that they are free of permanent magnetism. These correctors are the（）.
A:fore-and-aft and athwartships magnets
B:dip needle and heeling magnet
C:heeling magnet and Flinders bar
D:Flinders bar and quadrantal spheres

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