The agonic line on an isomagnetic chart indicates the （）.<br>A:magnetic equator<br>B:magnetic longitude reference line<br>C:points where there is no variation<br>D:points where there is no annual change in variation

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

出自：海船船员证

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