单选题At the magnetic equator there is no induced magnetism in the vertical soft iron because().Athe lines of force cross the equator on a 0°-180°alignmentBthe quadrantal error is 0°Cthere is no vertical component of the Earth's magnetic fieldDthe intercardinal headings have less than 1°

单选题
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°


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