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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