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
While in drydock your vessel will be belt-gauged.This process involves（）.
When crossing the magnetic equator the（）.
Which magnetic compass corrector（s）can be set while the vessel is on a heading of magnetic north or magnetic south（）.
The variation for most given areas undergoes（）change，the amount of which is also noted on charts.
The quadrantal spheres are used to（）.
What is the basic principle of the magnetic compass（）.
Any piece of metal on becoming magnetized will develop regions of concentrated magnetism called（）.
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（）.
By convention，the north seeking ends of a compass’ magnets are colored（）.
Variation is the angular measurement between（）.