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单选题
Magnets in the binnacles of magnetic compasses are used to reduce the effect of（）.
A
deviation
B
variation
C
local attraction
D
All of the above
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单选题When adjusting a magnetic compass using the fore-and-aft permanent magnets，you should（）.A
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单选题The vertical component of the Earth’s magnetic field causes induced magnetism in vertical soft iron. This changes with latitude. What corrects for this coefficient of the deviation? （）A
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单选题The MOST important feature of the material used for making the binnacle of a standard magnetic compass is that it is（）.A
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单选题（）is used for measuring horizontal and vertical angles.A
The marine sextantB
ThechronometerC
The magnetic compassD
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be shielded from direct sunlightB
be locked into a constant headingC
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单选题Magnets are placed in horizontal trays in the compass binnacle to compensate for the（）.A
induced magnetism in the vessel's horizontal soft ironB
change in the magnetic field when the vessel inclines from verticalC
permanent magnetism of the vesselD
magnetic fields caused by electrical currents in the vicinity
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