At the magnetic equator there is no induced magnetism in the vertical soft iron because().

A . the lines of force cross the equator on a 0°-180°alignment B . the quadrantal error is 0° C . there is no vertical component of the Earth's magnetic field D . the intercardinal headings have less than 1&deg

时间:2022-10-21 15:23:02 所属题库:地文航海题库

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