When adjusting a magnetic compass for error，a deviation table should be made（）.<br>A:before correcting for any deviation<br>B:after correcting for variation<br>C:after adjusting the fore-and-aft and athwartships permanent magnets<br>D:before the quadrantal correctors are placed on the compass

When adjusting a magnetic compass for error，a deviation table should be made（）.
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

出自：海船船员证

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