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
更多“Before a magnetic compass is adjusted certain correctors must be checked to ensure that they are free of permanent magnetism. These correctors are the（）.”相关的问题
A、before correcting for any deviation B、after correcting for variation C、after adjusting the fore-and-aft and athwartships permanent magnets D、before the quadrantal correctors are placed on the compass
A、north magnetic pole B、south magnetic pole C、magnetic prime vertical meridian D、magnetic equator
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
A、If the blue ends of the magnets are aft，and the fore-and-aft tray is at the top，you should add some magnets. B、If the blue ends of the magnets are aft you should lower the fore-and-aft tray C、If the blue ends of the magnets are aft，and the fore-and-aft tray is at the top，you should reverse the magnets D、If the blue ends of the magnets are forward，and the fore-and-aft tray is at the bottom，you should add some magnets
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