A.flux
B.poles
C.magnets
D.azimuth
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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
A.before correcting for any deviation
B.after correcting for variation
C.after adjusting the fore-and-aft and athwartships permanent magnets
D.before the quadrantal correctors are placed on the compass
最新試題
Variation is a compass error that you（）.
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（）.
While in drydock your vessel will be belt-gauged.This process involves（）.
When adjusting a magnetic compass for error，a deviation table should be made（）.
The most accurate method of determining gyrocompass error while underway is by（）.
The Flinders bar on a magnetic compass compensates for the（）.
The quadrantal spheres are used to（）.
When adjusting a magnetic compass using the fore-and-aft permanent magnets，you should（）.
Which magnetic compass corrector（s）can be set while the vessel is on a heading of magnetic north or magnetic south（）.