单选题The greatest directive force is exerted on the magnetic compass when the（）.Aneedles are nearly in line with the meridianBvessel is near the magnetic polesCvariation is near zeroDvessel is near the magnetic equator
单选题
The greatest directive force is exerted on the magnetic compass when the（）.
A
needles are nearly in line with the meridian
B
vessel is near the magnetic poles
C
variation is near zero
D
vessel is near the magnetic equator
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