A.Flinders bar
B.Soft iron spheres
C.Fore-and-aft permanent magnets in their trays
D.Heeling magnet
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A.Magnetic materials of the same polarity repel each other and those of opposite polarity attract
B.The Earth's magnetic lines of force are parallel to the surface of the Earth
C.Magnetic meridians connect points of equal magnetic variation
D.The compass needle（s）will，when properly compensated，lie parallel to the isogonic lines of the Earth
A.Worn gears in the compass housing
B.Magnetism from the earth's magnetic field
C.Magnetism within the vessel
D.Lack of oil in the compass bearings
A.will add to
B.will subtract from
C.may add to or subtract from
D.will not change
A.an annual
B.a constant
C.a variable
D.an unstable
A.Remove deviation on the intercardinal headings
B.Remove deviation on the cardinal compass headings
C.Remove heeling error
D.Compensate for induced magnetism in vertical soft iron
最新試題
This induced magnetism（）the permanent magnetism already present in the ship.
When a magnetic compass is not in use for a prolonged period of time it should（）.
What is used to correct for both induced and permanent magnetism，and consequently must be readjusted with radical changes in latitude（）.
While in drydock your vessel will be belt-gauged.This process involves（）.
Which statement about the Flinders bar of the magnetic compass is CORRECT（）.
When adjusting a magnetic compass for error，a deviation table should be made（）.
The magnetism in the various structures of a ship changing as a result of cruising，vibration，or aging is termed（）.
The line which connects the points of zero magnetic dip is（）.
Variation is the angular measurement between（）.
Variation in a compass is caused by（）.