intensifications
justifications
records
correlations
fluctuations
第1题:
A ship under construction or major repair will acquire permanent magnetism due to ______ while sitting stationary in the earth's magnetic field.
A.hammering and jarring
B.vibration and pounding
C.varying magnetic fields
D.stable or permanent magnetism of the ship
第2题:
Deviation in a compass is caused by the ______.
A.vessel’s geographic position
B.vessel’s heading
C.earth’s magnetic field
D.influence of the magnetic materials of the vessel
第3题:
Permanent magnetism is caused by ______.
A.operation of electrical equipment and generators on board ship
B.the earth's magnetic field affecting the ship's hard iron during construction
C.the horizontal component of the earth's magnetic field acting on the horizontal soft iron
D.the vertical component of the earth's magnetic field acting on the vertical soft iron
第4题:
begun to change in the opposite direction
been weakening in strength for a long time
caused the changes on the polarities
misguided many a man and animal
第5题:
If a magnetic compass is not affected by any magnetic field other than the Earth’s which statement is TRUE?______.
A.Compass error and variation are equal
B.Compass north will be true north
C.Variation will equal deviation
D.There will be no compass error
第6题:
Compass deviation is caused by ______.
A.magnetism from the earth’s magnetic field
B.misalignment of the compass
C.magnetism within the vessel
D.a dirty compass housing
第7题:
Generally speaking, you should expect to find low atmospheric pressure prevailing in the earth’s ______.
A.equatorial area
B.polar regions
C.mid-latitudes
D.All of the above
第8题:
The direction of prevailing winds in the Northern hemisphere is caused by the ______.
A.Magnetic field at the North Pole
B.Gulf Stream
C.Earth's rotation
D.Arctic cold fronts
第9题:
第10题:
changes in the earth's magnetic field
nearby magnetic land masses or mineral deposits
magnetic influence inherent to that particular vessel
the magnetic lines of force not coinciding with the lines of longitude