单选题The agonic line on an isomagnetic chart indicates the （）.Amagnetic equatorBmagnetic longitude reference lineCpoints where there is no variationDpoints where there is no annual change in variation
单选题
The agonic line on an isomagnetic chart indicates the （）.
A
magnetic equator
B
magnetic longitude reference line
C
points where there is no variation
D
points where there is no annual change in variation
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