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
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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
A.nonmagnetic
B.weatherproof
C.corrosion resistant
D.capable of being permanently affixed to the vessel
最新試題
A ship under construction or major repair will acquire permanent magnetism due to（）while sitting stationary in the earth’s magnetic field.
By convention，the north seeking ends of a compass’ magnets are colored（）.
Which compensates for errors introduced when the vessel heels over（）.
The variation for most given areas undergoes（）change，the amount of which is also noted on charts.
What are the only magnetic compass correctors that correct for both permanent and induced effects of magnetism?（）
The quadrantal spheres are used to（）.
While in drydock your vessel will be belt-gauged.This process involves（）.
What is an advantage of the magnetic compass aboard vessels?（）
When adjusting a magnetic compass using the fore-and-aft permanent magnets，you should（）.
Variation is the angular measurement between（）.