单选题Which magnetic compass corrector（s）CANNOT be set on a heading of magnetic east or magnetic west（）.AHeeling magnetBFlinders barCFore-and-aft magnetsDAll of the above can be set on magnetic east or magnetic west headings
单选题
Which magnetic compass corrector（s）CANNOT be set on a heading of magnetic east or magnetic west（）.
A
Heeling magnet
B
Flinders bar
C
Fore-and-aft magnets
D
All of the above can be set on magnetic east or magnetic west headings
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