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
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
A、Overcoming sliding friction B、Overcoming rolling friction C、Overcoming fluid friction D、Overcoming oil wedge friction
A、at each frame B、amidships C、one-third the distance from the bow D、one-third the distance from the stern