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
What is the basic principle of the magnetic compass（）.
By convention，the north seeking ends of a compass’ magnets are colored（）.
Which magnetic compass corrector（s）CANNOT be set on a heading of magnetic east or magnetic west（）.
Which statement about the Flinders bar of the magnetic compass is CORRECT（）.
When adjusting a magnetic compass using the fore-and-aft permanent magnets，you should（）.
A vessel is heading magnetic east and its magnetic compass indicates a heading of 086°.Which action should be taken to remove this error during compass adjustment（）.
When adjusting a magnetic compass for error，a deviation table should be made（）.
What is the basic principle of the magnetic compass?（）
The variation for most given areas undergoes（）change，the amount of which is also noted on charts.
A ship under construction or major repair will acquire permanent magnetism due to（）while sitting stationary in the earth’s magnetic field.