A、A.worn gears in the compass housing
B、B.magnetism from the earth's magnetic field
C、C.magnetism within the vessel
D、D.lack of oil in the compass bearings
更多“Variation in a compass is caused by（）.”相关的问题
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
A、Worn gears in the compass housing B、Magnetism from the earth's magnetic field C、Magnetism within the vessel D、Lack of oil in the compass bearings
A、above the polar circles B、in a low pressure area C、during periods of low temperatures D、in the doldrums
A、Gray lines on the uppermost inset chart B、Red lines on the main body of the chart C、In parenthesis on the lines of equal magnetic variation D、Annual rate of change is not shown
A、Gray lines on the uppermost inset chart B、Red lines on the main body of the chart C、In parenthesis on the lines of equal magnetic variation D、Annual rate of change is not shown
A、deviation minus variation B、variation plus compass course C、combined variation and deviation D、difference between true and magnetic heading
A、A.deviation minus variation B、B.variation plus compass course C、C.combined variation and deviation D、D.difference between true and magnetic heading
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