A.Black
B.Blue
C.Red
D.White
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A.flux
B.poles
C.magnets
D.azimuth
A.If the blue ends of the magnets are aft，and the fore-and-aft tray is at the top，you should add some magnets
B.If the blue ends of the magnets are aft you should lower the fore-and-aft tray
C.If the blue ends of the magnets are aft，and the fore-and-aft tray is at the top，you should reverse the magnets
D.If the blue ends of the magnets are forward，and the fore-and-aft tray is at the bottom，you should add some magnets
A.hammering and jarring
B.vibration and pounding
C.varying magnetic fields
D.stable or permanent magnetism of the ship
A.variation
B.deviation
C.variation and deviation
D.a correction for the direction of current set
A.use the magnets one at a time，putting one in one side and then one on the opposite side，one step higher
B.use the magnets in pairs，starting at the top，with trays at the highest point of travel
C.use the magnets in pairs，from the bottom up，with the trays at the lowest point of travel
D.fill all the trays with magnets，then remove them one-by-one until the deviation is removed
最新試題
What are the only magnetic compass correctors that correct for both permanent and induced effects of magnetism?（）
Which magnetic compass corrector（s）can be set while the vessel is on a heading of magnetic north or magnetic south（）.
Which compensates for errors introduced when the vessel heels over（）.
Any piece of metal on becoming magnetized will develop regions of concentrated magnetism called（）.
While in drydock your vessel will be belt-gauged.This process involves（）.
When crossing the magnetic equator the（）.
Which magnetic compass corrector（s）CANNOT be set on a heading of magnetic east or magnetic west（）.
The Flinders bar on a magnetic compass compensates for the（）.
Which statement about the gyrocompass is FALSE（）.
A ship under construction or major repair will acquire permanent magnetism due to（）while sitting stationary in the earth’s magnetic field.