问题 单项选择题

Which statement about the Flinders bar of the magnetic compass is CORRECT().

A.It compensates for the error caused by the vertical component of the Earth's magnetic field

B.It compensates for error caused by the heeling of a vessel

C.It compensates for quadrantal deviation

D.It is only needed in equatorial waters

答案

参考答案:A

选择题
多项选择题