At the magnetic equator there is no induced magnetism in the vertical soft iron because（）.<br>A:the lines of force cross the equator on a 0°-180°alignment<br>B:the quadrantal error is 0°<br>C:there is no vertical component of the Earth's magnetic field<br>D:the intercardinal headings have less than 1°

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°

出自：海船船员证

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