单选题Variation is the angular measurement between（）.Acompass north and magnetic northBcompass north and true northCmagnetic meridian and the geographic meridianDyour vessel's heading and the magnetic meridian
单选题
Variation is the angular measurement between（）.
A
compass north and magnetic north
B
compass north and true north
C
magnetic meridian and the geographic meridian
D
your vessel's heading and the magnetic meridian
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