A、induced magnetism in the vessel's horizontal soft iron
B、change in the magnetic field when the vessel inclines from vertical
C、permanent magnetism of the vessel
D、magnetic fields caused by electrical currents in the vicinity
更多“Magnets are placed in horizontal trays in the compass binnacle to compensate for the（）.”相关的问题
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、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、B.If the blue ends of the magnets are aft you should lower the fore-and-aft tray C、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、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、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
A、Place the eye from the forward line on the bollard and then place the eye from the second line directly over the first B、It makes no difference how the lines are placed C、Place the eye from either line on the bollard，and then bring the eye of the other line up through the eye of the first，and place it on the bollard D、Place both eyes on the bollard，in any manner，but lead both lines to the same winch head on the vessel and secure them on the winch
A、The soft iron spheres on the arms of the binnacle B、Magnets placed in trays inside the binnacle C、A single vertical magnet beneath the compass D、The Flinders bar
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
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