A.Flinders bar
B.Soft iron spheres
C.Fore-and-aft permanent magnets in their trays
D.Heeling magnet
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你可能感興趣的試題
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
When changing from a compass course to a true course you should apply（）.
The variation for most given areas undergoes（）change，the amount of which is also noted on charts.
What is used to correct for both induced and permanent magnetism，and consequently must be readjusted with radical changes in latitude（）.
This induced magnetism（）the permanent magnetism already present in the ship.
In more recent years，（）has been used by civilians in many new ways to determine positions，such as in automobile and boat navigation，hiking，emergency rescue，and precision agriculture and mining.
What is an advantage of the magnetic compass aboard vessels?（）
The most accurate method of determining gyrocompass error while underway is by（）.
When adjusting a magnetic compass for error，a deviation table should be made（）.
What are the only magnetic compass correctors that correct for both permanent and induced effects of magnetism?（）
When crossing the magnetic equator the（）.