单选题When adjusting a magnetic compass for error，a deviation table should be made（）.Abefore correcting for any deviationBafter correcting for variationCafter adjusting the fore-and-aft and athwartships permanent magnetsDbefore the quadrantal correctors are placed on the compass
单选题
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
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相关考题：
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