Along the magnetic equator
Connected by the isoclinal line
The isopors
The magnetic poles
第1题:
Isogonic lines are lines on a chart indicating ______.
A.points of equal variation
B.points of zero variation
C.the magnetic latitude
D.magnetic dip
第2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3题:
A.The earth's surface
B.The surface of earth
C.The surface earth
D.The earth surface
第4题:
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:
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7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8题:
The agonic line on an isomagnetic chart indicates the ______.
A.magnetic equator
B.magnetic longitude reference line
C.points where there is no variation
D.points where there is no annual change in variation
第9题:
Magnetic dip is a measurement of the angle between the ______.
A.geographic pole and the magnetic pole
B.lubber’s line and true north
C.horizontal and the magnetic line of force
D.compass heading and the magnetic heading
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