单选题What is used to correct for both induced and permanent magnetism，and consequently must be readjusted with radical changes in latitude（）.AFlinders barBSoft iron spheresCFore-and-aft permanent magnets in their traysDHeeling magnet
单选题
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
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