A.GPS
B.GMDSS
C.AIS
D.Navtex
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A.Black
B.Blue
C.Red
D.White
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
最新試題
When relieving the helm，the new helmsman should know the（）.
The quadrantal spheres are used to（）.
Variation in a compass is caused by（）.
The Flinders bar on a magnetic compass compensates for the（）.
The variation for most given areas undergoes（）change，the amount of which is also noted on charts.
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（）.
The line which connects the points of zero magnetic dip is（）.
Which magnetic compass corrector（s）can be set while the vessel is on a heading of magnetic north or magnetic south（）.
When changing from a compass course to a true course you should apply（）.
When crossing the magnetic equator the（）.