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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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.The course change should be made rapidly to prevent transient induced magnetism while passing the intercardinal headings
B.After the new heading is reached，the vessel should steam on that course for at least two minutes before the adjustment
C.During the course change，you should gently tap the compass to remove any error caused by friction on the pivot bearing
D.After steadying on the new heading，the compass card should be slewed by a magnet and allowed to oscillate freely to remove any gaussin error
A.be shielded from direct sunlight
B.be locked into a constant heading
C.have any air bubbles replaced with nitrogen
D.have the compensating magnets removed
A.Compass rose
B.Cursor
C.Plan position indicator
D.Variable range marker
A.Magnetic materials of the same polarity repel each other and those of opposite polarity attract
B.The Earth's magnetic lines of force are parallel to the surface of the Earth
C.Magnetic meridians connect points of equal magnetic variation
D.The compass needle(s) will，when properly compensated，lie parallel to the isogonic lines of the Earth
最新試題
What is the name of the movable，radial guide line used to measure direction on a radar?（）
Which statement about the Flinders bar of the magnetic compass is CORRECT（）.
What is used to correct for both induced and permanent magnetism，and consequently must be readjusted with radical changes in latitude（）.
The line which connects the points of zero magnetic dip is（）.
When a magnetic compass is not in use for a prolonged period of time it should（）.
Variation is the angular measurement between（）.
The most accurate method of determining gyrocompass error while underway is by（）.
Any piece of metal on becoming magnetized will develop regions of concentrated magnetism called（）.
The MOST important feature of the material used for making the binnacle of a standard magnetic compass is that it is（）.
When relieving the helm，the new helmsman should know the（）.