What is used to correct for both induced and permanent magnetism，and consequently must be readjusted with radical changes in latitude（）.<br>A:Flinders bar<br>B:Soft iron spheres<br>C:Fore-and-aft permanent magnets in their trays<br>D:Heeling magnet

What is used to correct for both induced and permanent magnetism，and consequently must be readjusted with radical changes in latitude（）.
A:Flinders bar
B:Soft iron spheres
C:Fore-and-aft permanent magnets in their trays
D:Heeling magnet

出自：海船船员证

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