The greatest directive force is exerted on the magnetic compass when the（）.<br>A:needles are nearly in line with the meridian<br>B:vessel is near the magnetic poles<br>C:variation is near zero<br>D:vessel is near the magnetic equator

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

出自：海船船员证

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