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单选题
If a ship is proceeding towards the magnetic equator，the uncorrected deviation due to permanent magnetism（）.
A
increases
B
remains the same
C
decreases
D
is unimportant and may be neglected
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单选题The advantage of geostationary satellites is（）.A
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fine the shipsD
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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°alignmentB
the quadrantal error is 0°C
there is no vertical component of the Earth's magnetic fieldD
the intercardinal headings have less than 1°
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